2025 CW 27 Microsoft 365 Message Center changes

Please note: Only common Message Center messages are in this list you should always check your Message Center for additional messages

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Changes

MC End Time changes

MC ID	MC Title	Old Value	New Value	MC Action required by
MC1041465	(Updated) New Microsoft Outlook for Windows and Outlook on the web: Optimized hover actions in the message list	09/15/2025 09:00:00	2025-11-10T08:00:00Z	N/A
MC1041756	(Updated) Microsoft Purview: IRM RBAC Change (related to Data Security Investigations) Preview	05/26/2025 09:00:00	2025-10-27T08:00:00Z	N/A
MC1041964	(Updated) Microsoft Outlook for iOS/Android: Large audience warnings for users	07/31/2025 09:00:00	2025-08-18T09:00:00Z	N/A
MC1059671	(Updated) Microsoft SharePoint Online eSignature for Microsoft Word	08/25/2025 09:00:00	2025-09-08T09:00:00Z	N/A
MC1066439	(Updated) New Microsoft Outlook for Windows and Outlook for the web: Jump to a message in the message list	08/29/2025 09:00:00	2025-09-08T09:00:00Z	N/A
MC1070180	(Updated) Microsoft Fabric: Workspace inbound/outbound access protection will be available by default (preview)	09/05/2025 09:00:00	2025-10-27T08:00:00Z	N/A
MC1093236	Microsoft Teams: An enhanced agent experience in Chats and Channels	08/29/2025 09:00:00	2025-12-31T08:00:00Z	N/A
MC886603	(Updated) Reject multiple From addresses (P2 From headers) without a Sender header	10/01/2025 10:00:00	2025-12-15T09:00:00Z	N/A
MC981462	(Updated) Multiple account access to Copilot in Microsoft 365 desktop and mobile apps	07/28/2025 09:00:00	2025-08-18T09:00:00Z	N/A

MC Messages changes

MC ID	MC Title	Old Value	New Value	MC Action required by
MC1037767	(Updated) Microsoft Teams: Share Teams apps and agents from their profile or the Teams side panel	Updated May 30, 2025: We have updated the timeline below. Thank you for your patience. Coming soon: Users can share Microsoft Teams apps or agents from the app or agent profile and from the app side panel in Teams. This message applies to Teams for Windows desktop, Teams for Mac desktop and Teams on the web. A Microsoft 365 Copilot license is not required to share agents as described in this message. If a user has access to the agents, the users will be able to share them. This message is associated with Microsoft 365 Roadmap ID 483355. [When this will happen:] Targeted Release: We will begin rolling out early July 2025 and expect to complete by mid-July 2025. General Availability (Worldwide): We will begin rolling out mid-July 2025 and expect to complete by late July 2025.	Updated June 30, 2025: We have updated the timeline below. Thank you for your patience. Coming soon: Users can share Microsoft Teams apps or agents from the app or agent profile and from the app side panel in Teams. This message applies to Teams for Windows desktop, Teams for Mac desktop and Teams on the web. A Microsoft 365 Copilot license is not required to share agents as described in this message. If a user has access to the agents, the users will be able to share them. This message is associated with Microsoft 365 Roadmap ID 483355. [When this will happen:] Targeted Release: We will begin rolling out early August 2025 and expect to complete by mid-August 2025. General Availability (Worldwide): We will begin rolling out mid-August 2025 and expect to complete by late August 2025	N/A
MC1041465	(Updated) New Microsoft Outlook for Windows and Outlook on the web: Optimized hover actions in the message list	Updated June 24, 2025: We have updated the timeline below. Thank you for your patience. In new Outlook for Windows and Outlook on the web, the hover actions in the message list will be moved to the Sender/From column to be more space-efficient and minimize unnecessary mouse travel for users with their Reading Pane set to Hide or Bottom. The large width occupied by the DateTime Received column will thus be reduced. For all users, a one-time shortcut to change/set your hover actions will be provided. After the changes to the hover actions, the first action will be replaced by a quick button (gear button) to change/set your hover actions. After that button has been triggered once, it will disappear, and your hover action settings will kick in fully. This message is associated with Microsoft 365 Roadmap ID 429868. [When this will happen:] Targeted Release: We will begin rolling out late June 2025 (previously early June) and expect to complete by late July 2025 (previously early July). General Availability (Worldwide, GCC, GCC High, DoD): We will begin rolling out late July 2025 (previously early July) and expect to complete by early August 2025 (previously late July).	Updated July 1, 2025: We have updated the timeline below. Thank you for your patience. In new Outlook for Windows and Outlook on the web, the hover actions in the message list will be moved to the Sender/From column to be more space-efficient and minimize unnecessary mouse travel for users with their Reading Pane set to Hide or Bottom. The large width occupied by the DateTime Received column will thus be reduced. For all users, a one-time shortcut to change/set your hover actions will be provided. After the changes to the hover actions, the first action will be replaced by a quick button (gear button) to change/set your hover actions. After that button has been triggered once, it will disappear, and your hover action settings will kick in fully. This message is associated with Microsoft 365 Roadmap ID 429868. [When this will happen:] Targeted Release: We will begin rolling out mid-July2 025 (previously late June) and expect to complete by mid-August 2025 (previously late July). General Availability (Worldwide, GCC, GCC High, DoD): We will begin rolling out mid-September 2025 (previously late July) and expect to complete by late September 2025 (previously early August).	N/A
MC1041756	(Updated) Microsoft Purview: IRM RBAC Change (related to Data Security Investigations) Preview	Microsoft Purview Insider Risk Management (IRM) will be adding a new role--Data Security Investigation Contributor--to the Insider Risk Management Investigators role group. This will allow members of the Insider Risk Management Investigators role group to launch a Data Security Investigation (DSI) from an IRM case. DSI is a new AI-powered solution that enables data security teams to identify incident-related data, conduct deep content analysis, and mitigate risk within one unified solution. DSI enables data security admins to efficiently identify incident-relevant content by searching their Microsoft 365 data estate to locate emails, Teams messages, Copilot prompts and responses, and documents. Once the investigation is scoped, DSI's generative AI capabilities allow admins to gain deeper insights into the impacted data, revealing critical security risks and sensitive information. Investigative capabilities include the ability to categorize evidence, perform vector searches, and examine impacted data for security and sensitive data risks. DSI visualizes correlations between investigation data, users, and their activities. To mitigate identified risks, DSI facilitates secure collaboration between partner teams. Post-investigation learnings can be used to refine existing policies to strengthen an organization's security practices. The integration between IRM and DSI allows an IRM investigator to identify when a risky user needs deeper investigation to launch a pre-scoped investigation directly from the user activity pane, allowing them to view content analysis related to that user and better assess post-incident data impact. This message is associated with roadmap ID 485707. [When this will happen:] Public Preview (Worldwide): We will begin rolling out early April 2025 and expect to complete by late April 2025. General Availability (Worldwide): We will begin rolling out in mid-June 2025 and expect to complete by mid-July 2025.	Updated July 2, 2025: We have updated the timeline below. Thank you for your patience. Microsoft Purview Insider Risk Management (IRM) will be adding a new role--Data Security Investigation Contributor--to the Insider Risk Management Investigators role group. This will allow members of the Insider Risk Management Investigators role group to launch a Data Security Investigation (DSI) from an IRM case. DSI is a new AI-powered solution that enables data security teams to identify incident-related data, conduct deep content analysis, and mitigate risk within one unified solution. DSI enables data security admins to efficiently identify incident-relevant content by searching their Microsoft 365 data estate to locate emails, Teams messages, Copilot prompts and responses, and documents. Once the investigation is scoped, DSI's generative AI capabilities allow admins to gain deeper insights into the impacted data, revealing critical security risks and sensitive information. Investigative capabilities include the ability to categorize evidence, perform vector searches, and examine impacted data for security and sensitive data risks. DSI visualizes correlations between investigation data, users, and their activities. To mitigate identified risks, DSI facilitates secure collaboration between partner teams. Post-investigation learnings can be used to refine existing policies to strengthen an organization's security practices. The integration between IRM and DSI allows an IRM investigator to identify when a risky user needs deeper investigation to launch a pre-scoped investigation directly from the user activity pane, allowing them to view content analysis related to that user and better assess post-incident data impact. This message is associated with roadmap ID 485707. [When this will happen:] Public Preview (Worldwide): We will begin rolling out early April 2025 and expect to complete by late April 2025. General Availability (Worldwide): We will begin rolling out in mid-July 2025 (previously mid-June) and expect to complete by mid-August 2025 (previously mid-July).	N/A
MC1041756	(Updated) Microsoft Purview: IRM RBAC Change (related to Data Security Investigations) Preview	Updated July 2, 2025: We have updated the timeline below. Thank you for your patience. Microsoft Purview Insider Risk Management (IRM) will be adding a new role--Data Security Investigation Contributor--to the Insider Risk Management Investigators role group. This will allow members of the Insider Risk Management Investigators role group to launch a Data Security Investigation (DSI) from an IRM case. DSI is a new AI-powered solution that enables data security teams to identify incident-related data, conduct deep content analysis, and mitigate risk within one unified solution. DSI enables data security admins to efficiently identify incident-relevant content by searching their Microsoft 365 data estate to locate emails, Teams messages, Copilot prompts and responses, and documents. Once the investigation is scoped, DSI's generative AI capabilities allow admins to gain deeper insights into the impacted data, revealing critical security risks and sensitive information. Investigative capabilities include the ability to categorize evidence, perform vector searches, and examine impacted data for security and sensitive data risks. DSI visualizes correlations between investigation data, users, and their activities. To mitigate identified risks, DSI facilitates secure collaboration between partner teams. Post-investigation learnings can be used to refine existing policies to strengthen an organization's security practices. The integration between IRM and DSI allows an IRM investigator to identify when a risky user needs deeper investigation to launch a pre-scoped investigation directly from the user activity pane, allowing them to view content analysis related to that user and better assess post-incident data impact. This message is associated with roadmap ID 485707. [When this will happen:] Public Preview (Worldwide): We will begin rolling out early April 2025 and expect to complete by late April 2025. General Availability (Worldwide): We will begin rolling out in mid-July 2025 (previously mid-June) and expect to complete by mid-August 2025 (previously mid-July).	Updated July 3, 2025: We have updated the timeline below. Thank you for your patience. Microsoft Purview Insider Risk Management (IRM) will be adding a new role--Data Security Investigation Contributor--to the Insider Risk Management Investigators role group. This will allow members of the Insider Risk Management Investigators role group to launch a Data Security Investigation (DSI) from an IRM case. DSI is a new AI-powered solution that enables data security teams to identify incident-related data, conduct deep content analysis, and mitigate risk within one unified solution. DSI enables data security admins to efficiently identify incident-relevant content by searching their Microsoft 365 data estate to locate emails, Teams messages, Copilot prompts and responses, and documents. Once the investigation is scoped, DSI's generative AI capabilities allow admins to gain deeper insights into the impacted data, revealing critical security risks and sensitive information. Investigative capabilities include the ability to categorize evidence, perform vector searches, and examine impacted data for security and sensitive data risks. DSI visualizes correlations between investigation data, users, and their activities. To mitigate identified risks, DSI facilitates secure collaboration between partner teams. Post-investigation learnings can be used to refine existing policies to strengthen an organization's security practices. The integration between IRM and DSI allows an IRM investigator to identify when a risky user needs deeper investigation to launch a pre-scoped investigation directly from the user activity pane, allowing them to view content analysis related to that user and better assess post-incident data impact. This message is associated with roadmap ID 485707. [When this will happen:] Public Preview (Worldwide): We will begin rolling out early April 2025 and expect to complete by late April 2025. General Availability (Worldwide): We will begin rolling out in mid-July 2025 (previously mid-June) and expect to complete by mid-August 2025 (previously mid-July).	N/A
MC1041964	(Updated) Microsoft Outlook for iOS/Android: Large audience warnings for users	Updated April 22, 2025: We have updated the timeline below. Thank you for your patience. Coming soon for Microsoft Outlook for iOS/Android: Users will receive a warning when they are about to send an email to a large number of recipients, which can help them make the correct decision about wording, tone, and content. [When this will happen:] General Availability (Worldwide, GCC, GCC High): We will begin rolling out early May 2025 (previously mid-April) and expect to complete by early June 2025 (previously mid-May).	Updated July 1, 2025: We have updated the timeline below. Thank you for your patience. Coming soon for Microsoft Outlook for iOS/Android: Users will receive a warning when they are about to send an email to a large number of recipients, which can help them make the correct decision about wording, tone, and content. [When this will happen:] General Availability (Worldwide, GCC, GCC High): We will begin rolling out early May 2025 (previously mid-April) and expect to complete by early July 2025 (previously early June).	N/A
MC1059671	(Updated) Microsoft SharePoint Online eSignature for Microsoft Word	Currently, SharePoint eSignature includes the capability to request eSignatures from a PDF using Microsoft's native eSignature service. With this update, users will also be able to create eSignature requests from Microsoft Word documents without the need to create a PDF. The rollout may take several weeks for some regions. Check the regional availability here. This message is associated with Microsoft 365 Roadmap ID 486707. [When this will happen:] General Availability (Worldwide): We will begin rolling out in late May 2025 and expect to complete by early July 2025.	Updated July 2, 2025: We have updated the timeline below. Thank you for your patience. Currently, SharePoint eSignature includes the capability to request eSignatures from a PDF using Microsoft's native eSignature service. With this update, users will also be able to create eSignature requests from Microsoft Word documents without the need to create a PDF. The rollout may take several weeks for some regions. Check the regional availability here. This message is associated with Microsoft 365 Roadmap ID 486707. [When this will happen:] General Availability (Worldwide): We will begin rolling out in late May 2025 and expect to complete by late July 2025 (previously early July).	N/A
MC1059675	(Updated) Microsoft Teams: Pop out live captions and Real-Time Text (RTT) in Teams meetings	Updated May 15, 2025: We have updated the timeline below. Thank you for your patience. We're introducing the ability to pop out live captions (including live translated captions) and Real-Time Text (RTT) in Microsoft Teams meetings and calls. This new functionality gives users more flexibility and control over how they view text-based communication during meetings, supporting both accessibility and multitasking needs. This message is associated with Microsoft 365 Roadmap ID 484113. [When this will happen:] Targeted Release: We will begin rolling out mid-June 2025 (previously early May) and expect to complete by late June 2025 (previously mid-May). General Availability (Worldwide, GCC): We will begin rolling out late June 2025 (previously early May) and expect to complete by mid-July 2025 (previously mid-May). General Availability (GCCH): We will begin rolling out mid-July 2025 (previously early June) and expect to complete by late July 2025 (previously mid-June). General Availability (DoD): We will begin rolling out early August 2025 (previously early July) and expect to complete by mid-August 2025 (previously mid-July).	Updated July 3, 2025: We have updated the timeline below. Thank you for your patience. We're introducing the ability to pop out live captions (including live translated captions) and Real-Time Text (RTT) in Microsoft Teams meetings and calls. This new functionality gives users more flexibility and control over how they view text-based communication during meetings, supporting both accessibility and multitasking needs. This message is associated with Microsoft 365 Roadmap ID 484113. [When this will happen:] Targeted Release: We will begin rolling out early April 2025 (previously early May) and expect to complete by mid-April 2025 (previously late June). General Availability (Worldwide, GCC): We will begin rolling out mid-June 2025 (previously late June) and expect to complete by late June 2025 (previously mid-July). General Availability (GCCH): We will begin rolling out late June 2025 (previously mid-July) and expect to complete by early July 2025 (previously late July). General Availability (DoD): We will begin rolling out early July 2025 (previously early August) and expect to complete by mid-July 2025 (previously mid-August).	N/A
MC1066439	(Updated) New Microsoft Outlook for Windows and Outlook for the web: Jump to a message in the message list	Updated May 14, 2025: We have updated the timeline below. Thank you for your patience. Coming soon for new Microsoft Outlook for Windows desktop and Microsoft Outlook for the web: Users will be able to type text and jump to the next message in the message list. For example, when the message list is sorted by sender with From, users will be able to type "Philip" to jump to the first message where the sender is "Philip." This message is associated with Microsoft 365 Roadmap ID 490058. [When this will happen:] General Availability (Worldwide, GCC, GCC High, DoD): We will begin rolling out late May 2025 (previously early May) and expect to complete by late June 2025 (previously mid-June).	Updated July 2, 2025: We have updated the timeline below. Thank you for your patience. Coming soon for new Microsoft Outlook for Windows desktop and Microsoft Outlook for the web: Users will be able to type text and jump to the next message in the message list. For example, when the message list is sorted by sender with From, users will be able to type "Philip" to jump to the first message where the sender is "Philip." This message is associated with Microsoft 365 Roadmap ID 490058. [When this will happen:] General Availability (Worldwide, GCC, GCC High, DoD): We will begin rolling out late May 2025 (previously early May) and expect to complete by late July 2025 (previously late June).	N/A
MC1069563	Microsoft 365 admin center: Usage reports to manage metered consumption costs for Microsoft 365 Copilot Chat (preview)	To help you manage metered consumption costs for Microsoft 365 Copilot Chat, we will introduce a new Message consumption usage report in the Microsoft 365 admin center. The new report will give you visibility into billed messages associated with your Microsoft 365 Copilot pay-as-you-go billing policies and includes total messages consumed, cumulative and daily time series, and messages per user, per agent, and per agent-user pair. The new report will roll out in preview. During the preview stage, the report will display a maximum of 30 days of message consumption history. Usage information from prior to May 3, 2025 will not be available in the report. This message refers to Microsoft Copilot in a pay-as-you-go model. A Microsoft Copilot license is not required. This message is associated with Microsoft 365 Roadmap ID 490738. [When this will happen:] Public Preview: We will begin rolling out early May 2025 and expect to complete by late May 2025. General Availability (Worldwide): We will begin rolling out late July 2025 and expect to complete by late July 2025.	Updated July 1, 2025: We have updated the content. Thank you for your patience. To help you manage metered consumption costs for Microsoft 365 Copilot Chat, we will introduce a new Message consumption usage report in the Microsoft 365 admin center. The new report will give you visibility into billed messages associated with your Microsoft 365 Copilot pay-as-you-go billing policies and includes total messages consumed, cumulative and daily time series, and messages per user, per billing policy, per agent, and per agent-user pair. The new report will roll out in preview. During the preview stage, the report will display a maximum of 30 days of message consumption history. Usage information from prior to May 3, 2025, will not be available in the report. This message refers to Microsoft Copilot in a pay-as-you-go model. A Microsoft Copilot license is not required. This message is associated with Microsoft 365 Roadmap ID 490738. [When this will happen:] Public Preview: We will begin rolling out early May 2025 and expect to complete by late May 2025. General Availability (Worldwide): We will begin rolling out late July 2025 and expect to complete by late July 2025.	N/A
MC1069563	Microsoft 365 admin center: Usage reports to manage metered consumption costs for Microsoft 365 Copilot Chat (preview)	Updated July 1, 2025: We have updated the content. Thank you for your patience. To help you manage metered consumption costs for Microsoft 365 Copilot Chat, we will introduce a new Message consumption usage report in the Microsoft 365 admin center. The new report will give you visibility into billed messages associated with your Microsoft 365 Copilot pay-as-you-go billing policies and includes total messages consumed, cumulative and daily time series, and messages per user, per billing policy, per agent, and per agent-user pair. The new report will roll out in preview. During the preview stage, the report will display a maximum of 30 days of message consumption history. Usage information from prior to May 3, 2025, will not be available in the report. This message refers to Microsoft Copilot in a pay-as-you-go model. A Microsoft Copilot license is not required. This message is associated with Microsoft 365 Roadmap ID 490738. [When this will happen:] Public Preview: We will begin rolling out early May 2025 and expect to complete by late May 2025. General Availability (Worldwide): We will begin rolling out late July 2025 and expect to complete by late July 2025.	Updated July 3, 2025: We have updated the timeline below. Thank you for your patience. To help you manage metered consumption costs for Microsoft 365 Copilot Chat, we will introduce a new Message consumption usage report in the Microsoft 365 admin center. The new report will give you visibility into billed messages associated with your Microsoft 365 Copilot pay-as-you-go billing policies and includes total messages consumed, cumulative and daily time series, and messages per user, per billing policy, per agent, and per agent-user pair. The new report will roll out in preview. During the preview stage, the report will display a maximum of 30 days of message consumption history. Usage information from prior to May 3, 2025, will not be available in the report. This message refers to Microsoft Copilot in a pay-as-you-go model. A Microsoft Copilot license is not required. This message is associated with Microsoft 365 Roadmap ID 490738. [When this will happen:] Public Preview: We will begin rolling out early May 2025 and expect to complete by late May 2025. General Availability (Worldwide): We will begin rolling out late September 2025 (previously late July) and expect to complete by late September 2025 (previously late July).	N/A
MC1070180	(Updated) Microsoft Fabric: Workspace inbound/outbound access protection will be available by default (preview)	Updated May 30, 2025: We have updated the timeline below. Thank you for your patience. Microsoft Fabric will introduce two Preview features called Workspace-level private links and Outbound access protection at the Fabric workspace level. At the tenant level, the corresponding settings Configure workspace level inbound network rules and Configure workspace level outbound network rules will be in the Advanced networking section of the Fabric admin portal. The new tenant-level settings will be enabled by default, which will allow the workspace admins to configure Workspace-level private links and Outbound access protection. The workspace admin will then decide whether to configure these features at the workspace level. You (the tenant admin) can switch off the tenant toggle in the Fabric admin center if you decide not to make this feature available to your workspace admins. [When this will happen:] Public Preview (Worldwide): We will begin rolling out in late June 2025 (previously early June). We will communicate the plan for General Availability in a future post.	Updated July 3, 2025: We have updated the timeline below. Thank you for your patience. Microsoft Fabric will introduce two Preview features called Workspace-level private links and Outbound access protection at the Fabric workspace level. At the tenant level, the corresponding settings Configure workspace level inbound network rules and Configure workspace level outbound network rules will be in the Advanced networking section of the Fabric admin portal. The new tenant-level settings will be enabled by default, which will allow the workspace admins to configure Workspace-level private links and Outbound access protection. The workspace admin will then decide whether to configure these features at the workspace level. You (the tenant admin) can switch off the tenant toggle in the Fabric admin center if you decide not to make this feature available to your workspace admins. [When this will happen:] Public Preview (Worldwide): We will begin rolling out in late August 2025 (previously late June). We will communicate the plan for General Availability in a future post.	N/A
MC1092459	(Updated) Microsoft Viva Insights: New prompt categories in the Microsoft Copilot Dashboard	Prompt categories will be available in Microsoft Copilot Dashboard in Microsoft Viva Insights on the web to help you understand key Copilot use cases for your organization. In Microsoft Copilot Chat (work), which is grounded in work data, these prompt categories will include Ask and find, Catch up, Draft and brainstorm, and Other. These metrics will be added to the metrics library in the advanced insights app. Learn more about Copilot Dashboard licensing requirements in Connect to the Microsoft Copilot Dashboard for Microsoft 365 customers | Microsoft Learn This message is associated with Microsoft 365 Roadmap ID 486698. General Availability (Worldwide): We will begin rolling late June 2025 and will complete by late July 2025.	Updated July 1, 2025: We have updated the timeline below. Thank you for your patience. Prompt categories will be available in Microsoft Copilot Dashboard in Microsoft Viva Insights on the web to help you understand key Copilot use cases for your organization. In Microsoft Copilot Chat (work), which is grounded in work data, these prompt categories will include Ask and find, Catch up, Draft and brainstorm, and Other. These metrics will be added to the metrics library in the advanced insights app. Learn more about Copilot Dashboard licensing requirements in Connect to the Microsoft Copilot Dashboard for Microsoft 365 customers | Microsoft Learn This message is associated with Microsoft 365 Roadmap ID 486698. General Availability (Worldwide): We will begin rolling early July 2025 (previously late June) and will complete by late July 2025.	N/A
MC1093912	Microsoft Outlook for iOS/Android: Improved Contacts with profile enrichment and duplicate management	We're enhancing the contact experience in Microsoft Outlook Mobile (iOS and Android) by introducing profile-enriched contacts and automatic duplicate contact management. These improvements aim to streamline contact views and provide richer organizational context. This message is associated with Microsoft 365 Roadmap ID 493753. This feature has previously been released to the People Hub in new Outlook for Windows. More details in MC927963 (Updated) New Microsoft Outlook for Windows: People Hub improvements (published November 2024, updated April 2025). [When this will happen:] General Availability (Worldwide): We will begin rolling out late June 2025 and expect to complete by early September 2025.	Updated July 2, 2025: We have updated the timeline below. Thank you for your patience. We're enhancing the contact experience in Microsoft Outlook Mobile (iOS and Android) by introducing profile-enriched contacts and automatic duplicate contact management. These improvements aim to streamline contact views and provide richer organizational context. This message is associated with Microsoft 365 Roadmap ID 493753. This feature has previously been released to the People Hub in new Outlook for Windows. More details in MC927963 (Updated) New Microsoft Outlook for Windows: People Hub improvements (published November 2024, updated April 2025). [When this will happen:] General Availability (Worldwide): We will begin rolling out mid-July 2025 (previously late June) and expect to complete by mid-September 2025 (previously early September).	N/A
MC1096885	Mail Bombing Detection technology in Microsoft Defender for Office 365	We're introducing a new detection capability in Microsoft Defender for Office 365 to help protect your organization from a growing threat known as email bombing. This form of abuse floods mailboxes with high volumes of email to obscure important messages or overwhelm systems. The new "Mail Bombing" detection will automatically identify and block these attacks, helping security teams maintain visibility into real threats. [When this will happen:] General Availability (Worldwide): We will begin rolling out in late June 2025 and expect to complete by late July 2025.	Updated July 1, 2025: We have updated the timeline below. Thank you for your patience. We're introducing a new detection capability in Microsoft Defender for Office 365 to help protect your organization from a growing threat known as email bombing. This form of abuse floods mailboxes with high volumes of email to obscure important messages or overwhelm systems. The new "Mail Bombing" detection will automatically identify and block these attacks, helping security teams maintain visibility into real threats. [When this will happen:] General Availability (Worldwide): We will begin rolling out in late June 2025 and expect to complete by early July 2025 (previously late July).	N/A
MC886603	(Updated) Reject multiple From addresses (P2 From headers) without a Sender header	Updated March 21, 2025: We have updated the rollout timeline below. Thank you for your patience. We are proactively opting tenants out of the rollout that were detected as sending high volumes of emails exhibiting multiple From addresses without a Sender address header. These exempted senders will only be able to send emails exhibiting multiple From addresses without a Sender address header to recipients belonging to the same tenant as the sender. We will provide a subsequent update by the end of May 2025 (previously end of March) with an updated timeline for tenants that are opted out. We're going to start gradually dropping messages that have multiple From addresses (also known as P2 From headers) without a Sender header from being processed via Exchange Online, please review the section "When this will happen" for rollout timeline information for your tenant. If we see significant traffic exhibiting multiple From addresses (P2 From headers) without a Sender header in your tenant in the month of September, we will send you a Message Center Post by October 15th alerting you and providing some sample message IDs. We are doing this to comply with RFC 5322 (https://www.rfc-editor.org/rfc/rfc5322#section-3.6.2) which mandates the Sender header to be present and contain a single address if the From header has more than one address. Noncompliance with this could be exploited by attackers, allowing them to impersonate a sender address by misleading the client into using the From header to determine the sender instead of the Sender header. [When this will happen:] General Availability (Worldwide, GCC): We will begin rolling out April 15, 2025, and expect to complete by May 15, 2025. GCC High, DOD: We will begin rolling out July 1, 2025, and expect to complete by August 1, 2025. We are delaying the rollout start date in order to provide more time to customers for investigating messages exhibiting multiple P2 From Addresses without a Sender Address. Most of the traffic exhibiting multiple P2 From Addresses without a Sender Address will be inbound spam destined for your tenant sent by malicious spammers on the internet. Some customers are sending legitimate emails with this malformed header configuration. On October 15, we sent a targeted MC post to customers showing high volumes of messages exhibiting multiple P2 From Addresses without a Sender Address as they may be impacted by this change. For investigating if you will be impacted by this change, focus your investigation on messages sent using On Premises Inbound Connectors to Exchange Online. Authenticated mail submission is not impacted because submitting messages like this using those submissions are not allowed (Graph, Outlook clients, SMTP AUTH Client Submission).	Updated July 2, 2025: We have updated the timeline below. Thank you for your patience. We are proactively opting tenants out of the rollout that were detected as sending high volumes of emails exhibiting multiple From addresses without a Sender address header. These exempted senders will only be able to send emails exhibiting multiple From addresses without a Sender address header to recipients belonging to the same tenant as the sender. We will provide a subsequent update by the end of May 2025 (previously end of March) with an updated timeline for tenants that are opted out. We're going to start gradually dropping messages that have multiple From addresses (also known as P2 From headers) without a Sender header from being processed via Exchange Online, please review the section "When this will happen" for rollout timeline information for your tenant. If we see significant traffic exhibiting multiple From addresses (P2 From headers) without a Sender header in your tenant in the month of September, we will send you a Message Center Post by October 15th alerting you and providing some sample message IDs. We are doing this to comply with RFC 5322 (https://www.rfc-editor.org/rfc/rfc5322#section-3.6.2) which mandates the Sender header to be present and contain a single address if the From header has more than one address. Noncompliance with this could be exploited by attackers, allowing them to impersonate a sender address by misleading the client into using the From header to determine the sender instead of the Sender header. [When this will happen:] General Availability (Worldwide, GCC): We will begin rolling out April 15, 2025, and expect to complete by May 15, 2025. GCC High, DOD: We will begin rolling out October 7, 2025 (previously July 1), and expect to complete by November 1, 2025 (previously August 1). We are delaying the rollout start date in order to provide more time to customers for investigating messages exhibiting multiple P2 From Addresses without a Sender Address. Most of the traffic exhibiting multiple P2 From Addresses without a Sender Address will be inbound spam destined for your tenant sent by malicious spammers on the internet. Some customers are sending legitimate emails with this malformed header configuration. On October 15, we sent a targeted MC post to customers showing high volumes of messages exhibiting multiple P2 From Addresses without a Sender Address as they may be impacted by this change. For investigating if you will be impacted by this change, focus your investigation on messages sent using On Premises Inbound Connectors to Exchange Online. Authenticated mail submission is not impacted because submitting messages like this using those submissions are not allowed (Graph, Outlook clients, SMTP AUTH Client Submission).	N/A
MC981462	(Updated) Multiple account access to Copilot in Microsoft 365 desktop and mobile apps	Updated May 29, 2025: We have updated the timeline below. Thank you for your patience. Multiple account access to Copilot in Microsoft 365 desktop and mobile apps will be available soon. [When will this happen] General availability (Worldwide): We will begin rolling out in early March 2025 and expect to complete by mid-June 2025 (previously mid-May). Cloud Policy to manage use will be available by late January 2025.	Updated July 2, 2025: We have updated the timeline below. Thank you for your patience. Multiple account access to Copilot in Microsoft 365 desktop and mobile apps will be available soon. [When will this happen] General availability (Worldwide): We will begin rolling out in early March 2025 and expect to complete by early July 2025 (previously mid-June). Cloud Policy to manage use will be available by late January 2025.	N/A

MC MessageTagNames changes

MC ID	MC Title	Old Value	New Value	MC Action required by
MC1041756	(Updated) Microsoft Purview: IRM RBAC Change (related to Data Security Investigations) Preview	New feature, User impact, Admin impact	Updated message, New feature, User impact, Admin impact	N/A
MC1059671	(Updated) Microsoft SharePoint Online eSignature for Microsoft Word	New feature, User impact, Admin impact	Updated message, New feature, User impact, Admin impact	N/A
MC1069563	Microsoft 365 admin center: Usage reports to manage metered consumption costs for Microsoft 365 Copilot Chat (preview)	New feature, Admin impact	Updated message, New feature, Admin impact	N/A
MC1092459	(Updated) Microsoft Viva Insights: New prompt categories in the Microsoft Copilot Dashboard	New feature, Admin impact	Updated message, New feature, Admin impact	N/A
MC1093912	Microsoft Outlook for iOS/Android: Improved Contacts with profile enrichment and duplicate management	Feature update, User impact, Admin impact	Updated message, Feature update, User impact, Admin impact	N/A
MC1096885	Mail Bombing Detection technology in Microsoft Defender for Office 365	New feature, Admin impact	Updated message, New feature, Admin impact	N/A

MC prepare changes

MC ID	MC Title	Old Value	New Value	MC Action required by
MC1059671	(Updated) Microsoft SharePoint Online eSignature for Microsoft Word	This capability is only available to users if the native SharePoint eSignature service is enabled and a group policy is applied. Enable SharePoint's native eSignature service: Overview of SharePoint eSignature. When this rollout is available: * Ensure the Word option is toggled On for your tenant in the Microsoft admin center. * Apply the Group Policy Allow the use of SharePoint eSignature for Microsoft Word to enable Word users to access the feature. * The policy can be acquired and deployed via the standard methods of the Cloud Policy Service, Microsoft Intune, and Group Policy Manager. 3. Inform users of the new eSignature experience available in Word. https://learn.microsoft.com/microsoft-365/syntex/esignature-overview https://learn.microsoft.com/microsoft-365/syntex/esignature-overview#regional-availability https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=486707	This capability is only available to users if the native SharePoint eSignature service is enabled and a group policy is applied. Enable SharePoint's native eSignature service: Overview of SharePoint eSignature. When this rollout is available: * Ensure the Word option is toggled On for your tenant in the Microsoft admin center. * Apply the Group Policy Allow the use of SharePoint eSignature for Microsoft Word to enable Word users to access the feature. * The policy can be acquired and deployed via the standard methods of the Cloud Policy Service, Microsoft Intune, and Group Policy Manager. 3. Inform users of the new eSignature experience available in Word. https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=486707	N/A

MC Title changes

MC ID	MC Title	Old Value	New Value	MC Action required by
MC1041756	(Updated) Microsoft Purview: IRM RBAC Change (related to Data Security Investigations) Preview	Microsoft Purview: IRM RBAC Change (related to Data Security Investigations) Preview	(Updated) Microsoft Purview: IRM RBAC Change (related to Data Security Investigations) Preview	N/A
MC1059671	(Updated) Microsoft SharePoint Online eSignature for Microsoft Word	Microsoft SharePoint Online eSignature for Microsoft Word	(Updated) Microsoft SharePoint Online eSignature for Microsoft Word	N/A
MC1092459	(Updated) Microsoft Viva Insights: New prompt categories in the Microsoft Copilot Dashboard	Microsoft Viva Insights: New prompt categories in the Microsoft Copilot Dashboard	(Updated) Microsoft Viva Insights: New prompt categories in the Microsoft Copilot Dashboard	N/A

CW27 New Office 365 Message Center items

MC ID	MC Title	MC Category	MC Workload	MC Major Change	MC Action required by
MC1106876	Microsoft Teams: First run experience and prompting users to release previous reservations	Plan For Change	Microsoft Teams	False	N/A
MC1106865	Microsoft Intune In Development for July 2025 is now available	Stay Informed	Microsoft Intune	False	N/A
MC1106569	Microsoft Power Automate – Testing framework for desktop flows	Stay Informed	Microsoft Power Automate	False	N/A
MC1107494	Microsoft Excel: Organization Data Types retire starting July 31, 2025	Plan For Change	Microsoft 365 for the web, Microsoft 365 apps	True	N/A
MC1107493	Retirement of Loop Component Rendering in Word for the Web	Plan For Change	Microsoft 365 for the web	True	N/A
MC1107491	Microsoft Teams: Compact notification size for users	Stay Informed	Microsoft Teams	False	N/A
MC1107490	Reminder: Updates to required permissions for Microsoft Graph Beta API deviceManagement	Plan For Change	Microsoft Intune	False	07/31/2025
MC1108131	Microsoft Edge: Microsoft 365 Copilot Chat entry point in Microsoft Edge for Business	Plan For Change	Microsoft 365 suite, Microsoft Copilot (Microsoft 365)	False	N/A
MC1108128	Update to Question Posting in Viva Engage Answers Tab	Plan For Change	Microsoft Viva	False	N/A
MC1108127	Viva Engage will soon support 14 more languages	Stay Informed	Microsoft Viva	False	N/A
MC1108849	3rd party citation add-in in Word reference tab	Stay Informed	Microsoft 365 for the web, Microsoft 365 apps	False	N/A
MC1108848	Changing output format for some database properties in Exchange Online cmdlets	Stay Informed	Exchange Online	False	N/A
MC1108847	Microsoft Places: Built in Admin roles support	Stay Informed	Microsoft 365 apps	False	N/A
MC1108845	Adaptive Scopes in Microsoft Purview – Support for Multivalued Attributes in “Not Equals” Queries	Plan For Change	Microsoft Purview	False	N/A
MC1108843	Microsoft Defender for Office 365: Ability to Disagree with admin submissions analysis	Stay Informed	Microsoft Defender XDR	False	N/A
MC1108842	Reminder: Action Required: Update OneNote to Ensure Seamless and Secure Sync	Plan For Change	Microsoft 365 apps	False	N/A
MC1108837	Microsoft Viva | Viva Engage: Streamlined verified answers for community experts	Stay Informed	Microsoft Viva	False	N/A
MC1108835	Product transitions to the cloud.microsoft domain – June 2025	Stay Informed	Microsoft 365 for the web	False	N/A
MC1108834	Microsoft Entra | Update to default sign-in background for Work or School accounts	Stay Informed	Microsoft Entra	False	N/A
MC1108827	Microsoft Viva Engage: Introducing segmentation for personalized experiences (preview)	Stay Informed	Microsoft Viva	False	N/A
MC1108784	Updates available for Microsoft 365 Apps for Current Channel	Stay Informed	Microsoft 365 apps	False	N/A

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