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MC1101906 Plan for changeUpdated messageNew featureAdmin impact

Offline Support for Calendar - Create, Edit and Delete Event support

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

Rollout

Roadmap
490059

Rollout dates are often only in the text. When Microsoft moves them, the change shows under "What changed".

Schedule dates changed in the text

Date phrases in schedule sentences differ between the versions this installation saw
  • Seen 23 Jan 2026 mid-December 2025 → early February 2026
  • Seen 4 Sep 2025 early September 2025, mid-September 2025, mid-October 2025 → late September 2025, late October 2025, mid-December 2025
  • Seen 4 Sep 2025 mid-August 2025 → early September 2025, mid-October 2025
  • Seen 16 Jul 2025 mid-June 2025, mid-July 2025 → mid-August 2025, mid-September 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 January 23, 2026: We have updated the timeline. Thank you for your patience.

We’re expanding offline capabilities in the new Outlook for Windows. Users will soon be able to create, edit, and delete single calendar events even when not connected to the internet. This enhancement improves productivity and flexibility when working offline.

This change is associated with Microsoft 365 Roadmap ID: 490059

When this will happen

Targeted Release: Rollout will begin in late September 2025 and is expected to complete by late October 2025.

General Availability (Worldwide): Rollout will begin in late October 2025 (previously mid-September) and is expected to complete by early February 2026 (previously mid-December 2025).

How this will affect your organization

Users with offline mode enabled in the new Outlook for Windows will be able to:

  • Create new single calendar events while offline.
  • Edit or delete existing calendar events that have been previously synchronized within the offline timeframe set in Outlook settings.

Note: Support for recurring (series) events while offline is not currently available.

This functionality is controlled by the existing mailbox policy setting:

OWAMailboxPolicy -OfflineEnabledWin.

If this policy is set to True, offline calendar functionality will be available. If set to False, it will be disabled. This update does not change the default value of the policy.

What you need to do to prepare

Ensure that offline mode is enabled for users who need this functionality. At the user level, this can be verified in the new Outlook under:

Settings > General > Offline

  • Enable offline email, calendar, and people

Admins can manage this setting using the Set-OwaMailboxPolicy cmdlet. Learn more here: Set-OwaMailboxPolicy

For end-user guidance, see: Work offline in Outlook

Compliance considerations

  • Does the change alter how existing customer data is processed, stored, or accessed? Yes – calendar data is now accessible and editable offline

What changed

Between archive captures, newest first

  1. Updated September 4, 2025:January 23, 2026: We have updated the timeline. Thank you for your patience. We’re expanding … in late October 2025 (previously mid-September) and is expected to complete by mid-December 2025early February 2026 (previously mid-October).mid-December 2025). How this will affect your organization: Users with offline mode enabled in …

  2. … ID: 490059 When this will happen: Targeted Release: Rollout will begin in earlylate September 2025 and is expected to complete by mid-Septemberlate October 2025. General Availability (Worldwide): Rollout will begin in mid-Septemberlate October 2025 (previously mid-August)mid-September) and is expected to complete by mid-Octobermid-December 2025 (previously mid-September).mid-October). How this will affect your organization: Users with offline mode enabled in …

  3. Updated July 16,September 4, 2025: We have updated the timeline. Thank you for your patience. We’re … is associated with Microsoft 365 Roadmap ID: 490059 When this will happen: Targeted Release: Rollout will begin in early September 2025 and is expected to complete by mid-September 2025. General Availability (Worldwide): Rollout will begin in mid-Augustmid-September 2025 (previously mid-August) and is expected to complete by mid-September 2025.mid-October 2025 (previously mid-September). How this will affect your organization: Users with offline mode enabled in …

    • Tags New feature, Admin impact → Updated message, New feature, Admin impact

    Updated July 16, 2025: We have updated the timeline. Thank you for your patience. We’re expanding offline capabilities in the new Outlook for Windows. Users will … 490059 When this will happen: General Availability (Worldwide): Rollout will begin in mid-Junemid-August 2025 and is expected to complete by mid-Julymid-September 2025. How this will affect your organization: Users with offline mode enabled …

  5. · first version seen

Learn more

Links from the notice and their documentation checks

No related evidence found in this installation's recent collection. This does not establish that no announcement exists.

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What this page cannot tell you
  • Whether your tenant is affected: this is Microsoft's notice, not a check of your settings.
  • 2 linked pages have not been read yet.
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