check before: 2025-11-22
Product:
Microsoft 365 suite, Outlook, Teams, To-Do
Platform:
Developer, Online, World tenant
Status:
Change type:
Feature update, User impact, Admin impact
Links:
Details:
Summary:
Microsoft products like Outlook and To Do are transitioning to the cloud.microsoft domain by November 2025, with gradual automatic redirects and no required user action. Admins should update documentation, ensure network compatibility, and educate users. The new domain enhances security using Microsoft’s exclusive top-level domain.
Details:
[Introduction]
The cloud.microsoft domain was provisioned in early 2023 to provide a unified, trusted, and dedicated DNS domain space to host Microsoft's first-party authenticated SaaS products and experiences. This post is to inform you that the following Microsoft products and scenarios are now available at the cloud.microsoft domain, in parallel with the previous domains:
Microsoft Outlook (https://outlook.cloud.microsoft/)
Microsoft To Do (https://todo.cloud.microsoft/)
[When this will happen]
The services listed above are already available on cloud.microsoft, in parallel with their previous domains.
Outlook is currently rolling out under Targeted Release and will expand to Standard Release in the coming months.
Users will begin seeing Outlook redirect from its old domains to outlook.cloud.microsoft as part of this change.
Change Category:
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Scope:
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Release Phase:
Created:
2025-11-22
updated:
2025-11-22
Task Type
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Docu to Check
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MS How does it affect me
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MS Preperations
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MS Urgency
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MS workload name
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summary for non-techies**
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Direct effects for Operations**
Domain Transition Impact
Users may experience confusion or disruption if they are not informed about the transition to the new cloud.microsoft domain, potentially leading to missed communications or inability to access services temporarily.
- roles: End Users, IT Support
- references: https://techcommunity.microsoft.com/t5/microsoft-365-blog/introducing-cloud-microsoft-a-unified-domain-for-microsoft-365/ba-p/3804961
Network Configuration Issues
If network configurations are not updated to allow access to the new cloud.microsoft domain, users may face connectivity issues, leading to interruptions in service availability.
- roles: Network Administrators, End Users
- references: https://learn.microsoft.com/microsoft-365/enterprise/urls-and-ip-address-ranges
Documentation and Training Gaps
Failure to update internal documentation and educate users about the new domain may result in confusion and increased support requests, impacting user experience and productivity.
- roles: IT Administrators, End Users
- references: https://devblogs.microsoft.com/microsoft365dev/action-required-ensure-your-microsoft-teams-apps-are-ready-for-upcoming-domain-changes/
Compatibility with In-House Applications
In-house Teams applications may not function correctly if they are not updated to support the new cloud.microsoft domain, leading to potential service disruptions for users.
- roles: Developers, End Users
- references: https://devblogs.microsoft.com/microsoft365dev/action-required-ensure-your-microsoft-teams-apps-are-ready-for-upcoming-domain-changes/
Security Perception
Users may be skeptical about the new domain due to the lack of familiarity with the .microsoft top-level domain, potentially leading to trust issues and reluctance to use the services.
- roles: End Users, IT Security
- references: https://support.microsoft.com/office/what-is-cloud-microsoft-7ba4c8b9-d062-4444-84a5-fca6c3006d2b
Configutation Options**
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Opportunities**
User Education and Training
With the transition to the cloud.microsoft domain, there is an opportunity to enhance user education regarding the benefits and security features of the new domain. This can improve user confidence and reduce potential confusion during the transition.
- next-steps: Develop training materials and sessions that explain the new domain, its advantages, and how to navigate any changes. Schedule training sessions for all users, focusing on those who use Outlook and To Do regularly.
- roles: IT Administrators, Training Coordinators, End Users
- references: https://support.microsoft.com/office/what-is-cloud-microsoft-7ba4c8b9-d062-4444-84a5-fca6c3006d2b, https://techcommunity.microsoft.com/t5/microsoft-365-blog/introducing-cloud-microsoft-a-unified-domain-for-microsoft-365/ba-p/3804961
Documentation Update
Updating internal documentation to reflect the new cloud.microsoft domain is crucial. This ensures that all users have access to accurate information and resources, minimizing confusion and support requests.
- next-steps: Audit existing documentation and assets for references to old URLs. Create a project plan to update all relevant documentation, including internal guides, FAQs, and support resources.
- roles: IT Administrators, Technical Writers, Support Staff
- references: https://devblogs.microsoft.com/microsoft365dev/action-required-ensure-your-microsoft-teams-apps-are-ready-for-upcoming-domain-changes/, https://learn.microsoft.com/microsoft-365/enterprise/urls-and-ip-address-ranges
" target="_blank" rel="nofollow noopener noreferrer">https://learn.microsoft.com/microsoft-365/enterprise/urls-and-ip-address-ranges
Network Configuration Review
As the new domain may require different network configurations, this is an opportunity to review and optimize the organization's network settings to ensure seamless access to cloud.microsoft services without disruptions.
- next-steps: Conduct a network assessment to identify any potential blocks or issues with the new domain. Ensure that all necessary firewall and proxy settings are updated to allow traffic to *.cloud.microsoft.
- roles: Network Administrators, IT Security Officers, System Administrators
- references: https://learn.microsoft.com/microsoft-365/enterprise/urls-and-ip-address-ranges, https://techcommunity.microsoft.com/t5/microsoft-365-blog/introducing-cloud-microsoft-a-unified-domain-for-microsoft-365/ba-p/3804961
Potentional Risks**
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IT Security**
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explanation for non-techies**
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