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MC1125491 Stay informedUpdated messageNew feature

Microsoft Outlook for Windows: Add attachments while offline

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

Rollout

Roadmap
496371

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 5 Jun 2026 early April 2026, late April 2026, early May 2026, late May 2026 → early June 2026, end of June 2026
  • Seen 9 Mar 2026 late November 2025, early January 2026, early February 2026, mid-February 2026, late February 2026 → late March 2026, early April 2026, late April 2026, early May 2026, late May 2026
  • Seen 28 Oct 2025 mid-December 2025, mid-January 2026, late January 2026 → early February 2026, mid-February 2026, late February 2026
  • Seen 23 Sep 2025 mid-September 2025, mid-October 2025, mid-November 2025, early December 2025 → late October 2025, early January 2026, mid-January 2026, late January 2026
  • Seen 27 Aug 2025 mid August 2025, mid September 2025, mid October 2025, late October 2025, early November 2025, mid November 2025 → mid-September 2025, mid-October 2025, mid-November 2025, late November 2025, early December 2025, mid-December 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, with source markup removed
Updated June 5, 2026: We have updated the timeline. Thank you for your patience.  Introduction We’re enhancing offline functionality in the new Microsoft Outlook for Windows. This update (Microsoft 365 Roadmap ID 496371) enables users to add file attachments while composing emails offline, improving productivity for those working without an internet connection. When this will happen Targeted Release (Worldwide): Rollout begins in late October 2025 and is expected to complete by late March 2026 (previously late November 2025). General Availability (Worldwide): This is now currently available. General Availability (GCC): Rollout begins in early June 2026 (previously early May) and is expected to complete by end of June 2026 (previously late May). How this affects your organization Users with offline mode enabled in the new Outlook for Windows will be able to attach files to draft emails while offline. These emails, including attachments, will be sent automatically once the device reconnects to the internet. This feature will be on or off by default based on your current configuration of the OWAMailboxPolicy-OfflineEnabledWin policy. No changes will be made to existing configurations. What you can do to prepare To enable this functionality, ensure the following settings are configured in the new Outlook under Settings > General > Offline: Enable offline email, calendar, and people Include file attachments Admins can manage this feature using the OWAMailboxPolicy-OfflineEnabledWin mailbox policy. Learn more at Set-OwaMailboxPolicy. Caption i. Offline editing can be enabled or disabled in Settings > General > Offline Compliance considerations No compliance considerations identified, review as appropriate for your organization.

What changed

Between archive captures, newest first

  1. Updated March 9,June 5, 2026: We have updated the timeline. Thank you for your patience.  Introduction … complete by late March 2026 (previously late November 2025). General Availability (Worldwide): Rollout begins in early April 2026 (previously early January) and This is expected to complete by late April 2026 (previously early February). now currently available. General Availability (GCC): Rollout begins in early MayJune 2026 (previously mid-February)early May) and is expected to complete by late Mayend of June 2026 (previously late February).May). How this affects your organization Users with offline mode enabled in the …

  2. Updated October 28, 2025:March 9, 2026: We have updated the timeline. Thank you for your patience.  Introduction We’re … begins in late October 2025 and is expected to complete by late March 2026 (previously late November 2025.2025). General Availability (Worldwide): Rollout begins in early JanuaryApril 2026 (previously mid-December 2025)early January) and is expected to complete by early Februarylate April 2026 (previously early January 2026). February). General Availability (GCC): Rollout begins in mid-Februaryearly May 2026 (previously mid-January 2026) mid-February) and is expected to complete by late FebruaryMay 2026 (previously late January 2026).February). How this affects your organization Users with offline mode enabled in the …

  3. Updated September 23,October 28, 2025: We have updated the timeline. Thank you for your patience.  Introduction … to complete by late November 2025. General Availability (Worldwide): Rollout begins in early January 2026 (previously mid-December 20252025) and is expected to complete by early February 2026 (previously early January 2026.2026). General Availability (GCC): Rollout begins in mid-February 2026 (previously mid-January 20262026) and is expected to complete by late February 2026 (previously late January 2026.2026). How this affects your organization Users with offline mode enabled in the …

  4. Updated August 27,September 23, 2025: We have updated the timeline. Thank you for your patience.   Introduction We’re enhancing offline functionality in the new Microsoft Outlook for Windows. … internet connection. When this will happen Targeted Release (Worldwide): Rollout begins in mid-Septemberlate October 2025 and is expected to complete by mid-Octoberlate November 2025. General Availability (Worldwide): Rollout begins in mid-Novembermid-December 2025 and is expected to complete by late November 2025.early January 2026. General Availability (GCC): Rollout begins in early December 2025 mid-January 2026 and is expected to complete by mid-December 2025.late January 2026. How this affects your organization Users with offline mode enabled in the …

    • Tags New feature → Updated message, New feature

    Updated August 27, 2025: We have updated the timeline. Thank you for your patience. Introduction We’re enhancing offline functionality in the new Microsoft Outlook for Windows. … internet connection. When this will happen Targeted Release (Worldwide): Rollout begins in mid August mid-September 2025 and is expected to complete by mid September mid-October 2025. General Availability (Worldwide): Rollout begins in mid October mid-November 2025 and is expected to complete by late OctoberNovember 2025. General Availability (GCC): Rollout begins in early NovemberDecember 2025 and is expected to complete by mid Novembermid-December 2025. How this affects your organization Users with offline mode enabled in …

  6. · first version seen

Linked documentation

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

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  • Whether your tenant is affected: this is Microsoft's notice, not a check of your settings.
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