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MC1129730 Plan for changeMajor changeUpdated messageUser impactAdmin impactRetirement

Remove toggle for Calendar in Teams

From Microsoft 365 Message Center Archive by Merill Fernando · Microsoft may not have sent this notice to your tenant.
Microsoft Teams
Microsoft 365 admin center

Schedule dates changed in the text

Date phrases in schedule sentences differ between the versions this installation saw
  • Seen 11 Feb 2026 end of January 2026 → late February 2026
  • Seen 1 Dec 2025 Early November 2025, Mid-November 2025 → Mid-January 2026, end of January 2026
  • Seen 25 Sep 2025 Early September 2025, Mid September 2025, Mid-September 2025, September 2025, Late November 2025, Early December 2025 → Early November 2025

Read from date phrases in Microsoft's text, not from notice metadata. A changed phrase can be a moved rollout, a new milestone or just rewording; "What changed" below shows which.

What the notice says

Microsoft’s text, safely structured

Updated February 11, 2026: 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 late February 2026 (previously end of January)

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.

What changed

Between archive captures, newest first

  1. Updated December 1, 2025:February 11, 2026: We have updated the timeline. After further review, we will not be … be removed. When this will happen General Availability (Worldwide): Mid-January 2026 to late February 2026 (previously end of January 2026January) How this affects your organization Once this update is deployed, users accessing …

  2. Updated November 25,December 1, 2025: We have updated the timeline. After further review, we will not be rolling this out to GCC, … new calendars will be removed. When this will happen General Availability (Worldwide): Early November 2025 - Mid-November 2025Mid-January 2026 to end of January 2026 How this affects your organization Once this update is deployed, users accessing …

  3. Updated SeptemberNovember 25, 2025: After further review, we will not be rolling this out to GCC, GCCHihg,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. 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 … 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 How this affects your organization Once this update is deployed, users accessing …

  4. 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 … and new calendars will be removed. When this will happen Public Preview:  Early SeptemberNovember 2025 – Mid September - Mid-November 2025 Targeted Release:  Early SeptemberNovember 2025 – Mid-September- Mid-November 2025 General Availability (Worldwide): Mid-September Early November 2025 – End September 2025 - Mid-November 20255 General Availability (Gallatin, GCC, GCC High, DoD, USSec): Mid-November 2025 – Late November 2025  After further review we have decided not to proceed with this change at this time. We apologize for any inconvenience. General Availability (USNat): Late November 2025 – Early December 2025  After further review we have decided not to proceed with this change at this time. We apologize for any inconvenience. How this affects your organization Once this update is deployed, users accessing …

    • Tags User impact, Admin impact, Retirement → Updated message, User impact, Admin impact, Retirement

    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 …

  6. · first version seen

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