check before: 2025-08-01
Product:
Exchange, Microsoft 365 Apps, Outlook, Windows
Platform:
Online, US Instances, Web, Windows Desktop, World tenant
Status:
Rolling out
Change type:
New feature, Updated message
Links:
Details:
Summary:
Microsoft Outlook for Windows will allow adding file attachments while offline, with rollout starting late October 2025 and completing by February 2026. Users can attach files to drafts offline, which send automatically when reconnected. Admins manage this via the OWAMailboxPolicy-OfflineEnabledWin policy.
Details:
Updated October 28, 2025: 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 November 2025.
General Availability (Worldwide): Rollout begins in early January 2026 (previously mid-December 2025) and is expected to complete by early February 2026 (previously early January 2026).
General Availability (GCC): Rollout begins in mid-February 2026 (previously mid-January 2026) and is expected to complete by late February 2026 (previously late January 2026).
Change Category:
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Scope:
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Release Phase:
General Availability, Targeted Release
Created:
2025-07-31
updated:
2025-10-28
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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linked item details
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Pictures
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summary for non-techies**
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Direct effects for Operations**
Offline Functionality Impact
If the change is implemented without preparation, users may experience confusion or frustration when attempting to attach files offline, leading to potential loss of productivity as they may not be aware of the new feature or how to enable it.
- roles: End Users, IT Support Staff
- references: https://learn.microsoft.com/powershell/module/exchange/set-owamailboxpolicy, https://www.microsoft.com/en-us/microsoft-365/roadmap?filters=&searchterms=496371
Policy Management Impact
Without proper preparation, administrators may face challenges in managing the OWAMailboxPolicy-OfflineEnabledWin policy, leading to inconsistent user experiences and potential security risks if offline attachments are not properly controlled.
- roles: System Administrators, Compliance Officers
- references: https://learn.microsoft.com/powershell/module/exchange/set-owamailboxpolicy, https://www.microsoft.com/en-us/microsoft-365/roadmap?filters=&searchterms=496371
Configutation Options**
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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 |
| 2025-10-28 | MC Last Updated | 09/23/2025 19:55:58 | 2025-10-28T17:29:07Z |
| 2025-10-28 | MC Messages | Updated 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. 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 November 2025. General Availability (Worldwide): Rollout begins in mid-December 2025 and is expected to complete by early January 2026. General Availability (GCC): Rollout begins in mid-January 2026 and is expected to complete by late January 2026. | Updated October 28, 2025: 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 November 2025. General Availability (Worldwide): Rollout begins in early January 2026 (previously mid-December 2025) and is expected to complete by early February 2026 (previously early January 2026). General Availability (GCC): Rollout begins in mid-February 2026 (previously mid-January 2026) and is expected to complete by late February 2026 (previously late January 2026). |
| 2025-10-28 | MC End Time | 03/02/2026 09:00:00 | 2026-03-27T09:00:00Z |
| 2025-10-28 | MC Summary | Microsoft Outlook for Windows will allow adding file attachments to emails while offline, with rollout from late October 2025 to January 2026. Emails with attachments will send automatically upon reconnection. The feature follows current offline policy settings and can be managed via the OWAMailboxPolicy-OfflineEnabledWin policy. | Microsoft Outlook for Windows will allow adding file attachments while offline, with rollout starting late October 2025 and completing by February 2026. Users can attach files to drafts offline, which send automatically when reconnected. Admins manage this via the OWAMailboxPolicy-OfflineEnabledWin policy. |
| 2025-09-24 | MC Last Updated | 08/27/2025 18:21:16 | 2025-09-23T19:55:58Z |
| 2025-09-24 | MC Messages | 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. 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 mid-September 2025 and is expected to complete by mid-October 2025. General Availability (Worldwide): Rollout begins in mid-November 2025 and is expected to complete by late November 2025. General Availability (GCC): Rollout begins in early December 2025 and is expected to complete by mid-December 2025. | Updated 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. 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 November 2025. General Availability (Worldwide): Rollout begins in mid-December 2025 and is expected to complete by early January 2026. General Availability (GCC): Rollout begins in mid-January 2026 and is expected to complete by late January 2026. |
| 2025-09-24 | MC End Time | 01/26/2026 09:00:00 | 2026-03-02T09:00:00Z |
| 2025-09-24 | MC Summary | Microsoft Outlook for Windows will allow adding file attachments to emails while offline, sending them automatically once reconnected. Rollout starts mid-September 2025 for Targeted Release and mid-November 2025 for General Availability. Admins can manage this via the OWAMailboxPolicy-OfflineEnabledWin policy. | Microsoft Outlook for Windows will allow adding file attachments to emails while offline, with rollout from late October 2025 to January 2026. Emails with attachments will send automatically upon reconnection. The feature follows current offline policy settings and can be managed via the OWAMailboxPolicy-OfflineEnabledWin policy. |
| 2025-08-28 | MC MessageTagNames | New feature | Updated message, New feature |
| 2025-08-28 | MC Summary | Microsoft Outlook for Windows will allow users to add file attachments to emails while offline, sending them automatically when reconnected. Rollout starts mid-August 2025 for Targeted Release and mid-October 2025 for General Availability. Admins can manage this via the OWAMailboxPolicy-OfflineEnabledWin policy. | Microsoft Outlook for Windows will allow adding file attachments to emails while offline, sending them automatically once reconnected. Rollout starts mid-September 2025 for Targeted Release and mid-November 2025 for General Availability. Admins can manage this via the OWAMailboxPolicy-OfflineEnabledWin policy. |
| 2025-08-28 | MC Last Updated | 07/31/2025 01:48:17 | 2025-08-27T18:21:16Z |
| 2025-08-28 | MC Messages | 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 mid August 2025 and is expected to complete by mid September 2025. General Availability (Worldwide): Rollout begins in mid October 2025 and is expected to complete by late October 2025. General Availability (GCC): Rollout begins in early November 2025 and is expected to complete by mid November 2025. | 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. 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 mid-September 2025 and is expected to complete by mid-October 2025. General Availability (Worldwide): Rollout begins in mid-November 2025 and is expected to complete by late November 2025. General Availability (GCC): Rollout begins in early December 2025 and is expected to complete by mid-December 2025. |
| 2025-08-28 | MC Title | Microsoft Outlook for Windows: Add attachments while offline | (Updated) Microsoft Outlook for Windows: Add attachments while offline |
| 2025-08-28 | MC End Time | 12/08/2025 09:00:00 | 2026-01-26T09:00:00Z |
Last updated 2 days ago ago
