💡 Our Technical Review in summary
Microsoft is finalizing the transition to the new Microsoft Teams calendar experience. This update unifies the calendar interface across Microsoft 365, including Teams, the new Outlook for Windows, Outlook on the web, and Microsoft Places. As part of this standardization, the legacy calendar interface is being deprecated, and the toggle that previously allowed users to switch between the “old” and “new” views will be permanently removed.
#### Impact
- User Interface: Users will no longer have the option to revert to the legacy Teams calendar. The new Microsoft 365 calendar experience will become the sole interface.
- Feature Integration: The new experience includes deeper integration with Microsoft Copilot and Microsoft Places to enhance collaboration and scheduling.
- Rollout Timeline: General Availability for Worldwide tenants is scheduled to begin in mid-January 2026 and complete by the end of January 2026.
- Scope Exceptions: This specific rollout excludes GCC, GCCH, DoD, USSec, and USNat environments. Separate communications will be provided for those sovereign cloud environments at a later date.
- Consistency: This change ensures a consistent scheduling experience regardless of whether the user is accessing their calendar via Teams or Outlook.
#### Action Required
- Documentation Update: Review and update internal IT help desk manuals, “Getting Started” guides, and any internal documentation that contains screenshots or instructions specifically for the legacy Teams calendar.
- User Communication: Notify users—particularly those who currently use the toggle to remain on the legacy view—that the transition will become mandatory in January 2026.
- Training: Familiarize support staff with the features of the new calendar, including its integration with Microsoft Places, to handle potential “how-to” inquiries.
- Technical Configuration: No administrative backend changes or PowerShell commands are required to implement this update, as it is a service-side change managed by Microsoft.
Microsoft Official Update
Service: N/A
Category: planForChange
Severity: normal
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
How this affects your organization
Once this update is deployed, users accessing the Calendar app in Microsoft Teams will see the new calendar experience by default. The toggle to switch between the old and new calendar will be removed, and only the new Microsoft 365 calendar will be available. This change may impact users accustomed to the legacy calendar interface.
What you can do to prepare
No admin action is required. We recommend informing your users about the upcoming change and updating any internal documentation or training materials that reference the legacy calendar experience.
For more information about the new calendar experience, visit the Microsoft Teams documentation.
Compliance considerations
No compliance considerations identified, review as appropriate for your organization.
