check before: 2026-01-15
Product:
Copilot, Outlook, Teams, Windows
Platform:
Online, US Instances, Web, World tenant
Status:
Change type:
Admin impact, Retirement, Updated message, User impact
Links:
Details:
Summary:
The new Microsoft Teams calendar experience will replace the legacy calendar, removing the toggle to switch back. This update rolls out worldwide from mid- to late January 2026, excluding GCC, GCCH, DoD, USSec, and USNat. No admin action is needed; inform users and update documentation accordingly.
Details:
Updated December 1, 2025: We have updated the timeline. After further review, we will not be rolling this out to GCC, GCCH, DoD, USSec, USNat during the timeline outlined below. We will communicate via Message center in dedicated posts when we are ready to proceed. Thank you for your patience.
We're introducing the new Microsoft Teams calendar experience, designed to unify and enhance productivity across Microsoft 365. This calendar integrates familiar features with innovations like Microsoft Copilot and Microsoft Places, enabling seamless collaboration from anywhere. It works consistently across Teams, the new Outlook for Windows, Outlook on the web, and Places. As part of this update, the legacy calendar experience will be deprecated, and the toggle to switch between old and new calendars will be removed.
When this will happen
General Availability (Worldwide): Mid-January 2026 to end of January 2026
Change Category:
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Scope:
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Release Phase:
Created:
2025-08-06
updated:
2025-12-02
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**
User Interface Change
Users will face a sudden change in the calendar interface, which may lead to confusion and decreased productivity as they adapt to the new layout and features.
- roles: End Users, Team Leaders
- references: https://learn.microsoft.com/microsoftteams/teams-calendar-overview
Loss of Familiar Features
The removal of the toggle means users will lose access to familiar features of the legacy calendar, potentially disrupting their workflow and collaboration.
- roles: End Users, Project Managers
- references: https://learn.microsoft.com/microsoftteams/teams-calendar-overview
Training and Documentation Gaps
Without prior preparation, users may not have access to updated training materials or documentation, leading to frustration and inefficiency in using the new calendar features.
- roles: End Users, Trainers
- references: https://learn.microsoft.com/microsoftteams/teams-calendar-overview
Increased Support Requests
The change may lead to an increase in support requests as users encounter issues or have questions about the new calendar experience, straining IT resources.
- roles: IT Support, Help Desk Staff
- references: https://learn.microsoft.com/microsoftteams/teams-calendar-overview
Collaboration Disruption
Teams accustomed to using the legacy calendar for scheduling may experience disruptions in collaboration and meeting planning, affecting overall team productivity.
- roles: End Users, Team Leaders
- references: https://learn.microsoft.com/microsoftteams/teams-calendar-overview
Configutation Options**
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Potentional Risks**
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IT Security**
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explanation for non-techies**
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** AI generated content. This information must be reviewed before use.
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change history
| Date | Property | old | new |
| 2025-12-02 | MC Last Updated | 11/25/2025 18:29:12 | 2025-12-01T18:27:07Z |
| 2025-12-02 | MC Messages | Updated November 25, 2025: After further review, we will not be rolling this out to GCC, GCCH, DoD, USSec, USNat during the timeline outlined below. We will communicate via Message center in dedicated posts when we are ready to proceed. Thank you for your patience.
We're introducing the new Microsoft Teams calendar experience, designed to unify and enhance productivity across Microsoft 365. This calendar integrates familiar features with innovations like Microsoft Copilot and Microsoft Places, enabling seamless collaboration from anywhere. It works consistently across Teams, the new Outlook for Windows, Outlook on the web, and Places. As part of this update, the legacy calendar experience will be deprecated, and the toggle to switch between old and new calendars will be removed. When this will happen General Availability (Worldwide): Early November 2025 - Mid-November 2025 | Updated December 1, 2025: We have updated the timeline. After further review, we will not be rolling this out to GCC, GCCH, DoD, USSec, USNat during the timeline outlined below. We will communicate via Message center in dedicated posts when we are ready to proceed. Thank you for your patience.
We're introducing the new Microsoft Teams calendar experience, designed to unify and enhance productivity across Microsoft 365. This calendar integrates familiar features with innovations like Microsoft Copilot and Microsoft Places, enabling seamless collaboration from anywhere. It works consistently across Teams, the new Outlook for Windows, Outlook on the web, and Places. As part of this update, the legacy calendar experience will be deprecated, and the toggle to switch between old and new calendars will be removed. When this will happen General Availability (Worldwide): Mid-January 2026 to end of January 2026 |
| 2025-12-02 | MC End Time | 02/02/2026 09:00:00 | 2026-03-31T10:00:00Z |
| 2025-12-02 | MC Summary | The new Microsoft Teams calendar experience will replace the legacy calendar, removing the toggle between them, with worldwide rollout in November 2025. GCC, GCCH, DoD, USSec, and USNat tenants are excluded for now. No admin action is needed; inform users and update documentation accordingly. | The new Microsoft Teams calendar experience will replace the legacy calendar, removing the toggle to switch back. This update rolls out worldwide from mid- to late January 2026, excluding GCC, GCCH, DoD, USSec, and USNat. No admin action is needed; inform users and update documentation accordingly. |
| 2025-11-26 | MC Messages | Updated September 25, 2025: After further review, we will not be rolling this out to GCC, GCCHihg, DoD, USSec, USNat during the timeline outlined below. We will communicate via Message center when we are ready to proceed. Thank you for your patience.
Updated September 11, 2025: This release is intended solely for commercial cloud environments. Separate release timelines will be communicated for special clouds and on-premises segments in dedicated posts. We're introducing the new Microsoft Teams calendar experience, designed to unify and enhance productivity across Microsoft 365. This calendar integrates familiar features with innovations like Microsoft Copilot and Microsoft Places, enabling seamless collaboration from anywhere. It works consistently across Teams, the new Outlook for Windows, Outlook on the web, and Places. As part of this update, the legacy calendar experience will be deprecated, and the toggle to switch between old and new calendars will be removed. When this will happen Public Preview: Early November 2025 - Mid-November 2025 Targeted Release: Early November 2025 - Mid-November 2025 General Availability (Worldwide): Early November 2025 - Mid-November 20255 General Availability (Gallatin, GCC, GCC High, DoD, USSec): After further review we have decided not to proceed with this change at this time. We apologize for any inconvenience. General Availability (USNat): After further review we have decided not to proceed with this change at this time. We apologize for any inconvenience. | Updated November 25, 2025: After further review, we will not be rolling this out to GCC, GCCH, DoD, USSec, USNat during the timeline outlined below. We will communicate via Message center in dedicated posts when we are ready to proceed. Thank you for your patience.
We're introducing the new Microsoft Teams calendar experience, designed to unify and enhance productivity across Microsoft 365. This calendar integrates familiar features with innovations like Microsoft Copilot and Microsoft Places, enabling seamless collaboration from anywhere. It works consistently across Teams, the new Outlook for Windows, Outlook on the web, and Places. As part of this update, the legacy calendar experience will be deprecated, and the toggle to switch between old and new calendars will be removed. When this will happen General Availability (Worldwide): Early November 2025 - Mid-November 2025 |
| 2025-11-26 | MC Last Updated | 09/25/2025 16:08:00 | 2025-11-25T18:29:12Z |
| 2025-11-26 | MC Summary | Microsoft Teams will remove the toggle for the legacy calendar, making the new integrated Microsoft 365 calendar the default starting early November 2025 for commercial clouds. GCC, GCC High, DoD, USSec, and USNat environments will not receive this update yet. No admin action is needed; inform users accordingly. | The new Microsoft Teams calendar experience will replace the legacy calendar, removing the toggle between them, with worldwide rollout in November 2025. GCC, GCCH, DoD, USSec, and USNat tenants are excluded for now. No admin action is needed; inform users and update documentation accordingly. |
| 2025-09-25 | MC Messages | Updated September 11, 2025: This release is intended solely for commercial cloud environments. Separate release timelines will be communicated for special clouds and on-premises segments in dedicated posts.
We're introducing the new Microsoft Teams calendar experience, designed to unify and enhance productivity across Microsoft 365. This calendar integrates familiar features with innovations like Microsoft Copilot and Microsoft Places, enabling seamless collaboration from anywhere. It works consistently across Teams, the new Outlook for Windows, Outlook on the web, and Places. As part of this update, the legacy calendar experience will be deprecated, and the toggle to switch between old and new calendars will be removed. When this will happen Public Preview: Early September 2025 - Mid September 2025 Targeted Release: Early September 2025 - Mid-September 2025 General Availability (Worldwide): Mid-September 2025 - End September 2025 General Availability (Gallatin, GCC, GCC High, DoD, USSec): Mid-November 2025 - Late November 2025 General Availability (USNat): Late November 2025 - Early December 2025 | Updated September 25, 2025: After further review, we will not be rolling this out to GCC, GCCHihg, DoD, USSec, USNat during the timeline outlined below. We will communicate via Message center when we are ready to proceed. Thank you for your patience.
Updated September 11, 2025: This release is intended solely for commercial cloud environments. Separate release timelines will be communicated for special clouds and on-premises segments in dedicated posts. We're introducing the new Microsoft Teams calendar experience, designed to unify and enhance productivity across Microsoft 365. This calendar integrates familiar features with innovations like Microsoft Copilot and Microsoft Places, enabling seamless collaboration from anywhere. It works consistently across Teams, the new Outlook for Windows, Outlook on the web, and Places. As part of this update, the legacy calendar experience will be deprecated, and the toggle to switch between old and new calendars will be removed. When this will happen Public Preview: Early November 2025 - Mid-November 2025 Targeted Release: Early November 2025 - Mid-November 2025 General Availability (Worldwide): Early November 2025 - Mid-November 20255 General Availability (Gallatin, GCC, GCC High, DoD, USSec): After further review we have decided not to proceed with this change at this time. We apologize for any inconvenience. General Availability (USNat): After further review we have decided not to proceed with this change at this time. We apologize for any inconvenience. |
| 2025-09-25 | MC Last Updated | 09/11/2025 17:38:30 | 2025-09-25T16:08:00Z |
| 2025-09-25 | MC Summary | Microsoft Teams is removing the toggle for the legacy calendar, making the new Microsoft 365 calendar the default. This update, launching from September to December 2025 across environments, requires no admin action but users should be informed and documentation updated accordingly. | Microsoft Teams will remove the toggle for the legacy calendar, making the new integrated Microsoft 365 calendar the default starting early November 2025 for commercial clouds. GCC, GCC High, DoD, USSec, and USNat environments will not receive this update yet. No admin action is needed; inform users accordingly. |
| 2025-09-12 | MC Messages | We're introducing the new Microsoft Teams calendar experience, designed to unify and enhance productivity across Microsoft 365. This calendar integrates familiar features with innovations like Microsoft Copilot and Microsoft Places, enabling seamless collaboration from anywhere. It works consistently across Teams, the new Outlook for Windows, Outlook on the web, and Places. As part of this update, the legacy calendar experience will be deprecated, and the toggle to switch between old and new calendars will be removed.
When this will happen Public Preview: Early September 2025 - Mid September 2025 Targeted Release: Early September 2025 - Mid-September 2025 General Availability (Worldwide): Mid-September 2025 - End September 2025 General Availability (Gallatin, GCC, GCC High, DoD, USSec): Mid-November 2025 - Late November 2025 General Availability (USNat): Late November 2025 - Early December 2025 | Updated September 11, 2025: This release is intended solely for commercial cloud environments. Separate release timelines will be communicated for special clouds and on-premises segments in dedicated posts.
We're introducing the new Microsoft Teams calendar experience, designed to unify and enhance productivity across Microsoft 365. This calendar integrates familiar features with innovations like Microsoft Copilot and Microsoft Places, enabling seamless collaboration from anywhere. It works consistently across Teams, the new Outlook for Windows, Outlook on the web, and Places. As part of this update, the legacy calendar experience will be deprecated, and the toggle to switch between old and new calendars will be removed. When this will happen Public Preview: Early September 2025 - Mid September 2025 Targeted Release: Early September 2025 - Mid-September 2025 General Availability (Worldwide): Mid-September 2025 - End September 2025 General Availability (Gallatin, GCC, GCC High, DoD, USSec): Mid-November 2025 - Late November 2025 General Availability (USNat): Late November 2025 - Early December 2025 |
| 2025-09-12 | MC Title | Remove toggle for Calendar in Teams | (Updated) Remove toggle for Calendar in Teams |
| 2025-09-12 | MC Last Updated | 08/06/2025 01:18:34 | 2025-09-11T17:38:30Z |
| 2025-09-12 | MC MessageTagNames | User impact, Admin impact, Retirement | Updated message, User impact, Admin impact, Retirement |
| 2025-09-12 | MC Summary | Microsoft Teams will remove the toggle for the legacy calendar, making the new integrated Microsoft 365 calendar the default. This update rolls out from September to December 2025 across various environments. No admin action is needed, but users should be informed and documentation updated accordingly. | Microsoft Teams is removing the toggle for the legacy calendar, making the new Microsoft 365 calendar the default. This update, launching from September to December 2025 across environments, requires no admin action but users should be informed and documentation updated accordingly. |
Last updated 5 days ago ago
