(Updated) Microsoft Outlook for Windows: Add attachments while offline

Microsoft Outlook for Windows will allow users to add file attachments to emails while offline, sending them automatically once reconnected. Rollout is delayed to late March 2026 for Targeted Release and April-May 2026 for General Availability. Offline settings and policies control this feature.

2026-03-09T17:34:05.697Z

<p>Updated March 9, 2026: We have updated the timeline. Thank you for your patience.&nbsp;</p><p><b>Introduction</b></p><p>We’re enhancing offline functionality in the new Microsoft Outlook for Windows. This update (Microsoft 365 Roadmap ID <a href="https://www.microsoft.com/en-us/microsoft-365/roadmap?filters=&amp;searchterms=496371" target="_blank">496371</a>) enables users to add file attachments while composing emails offline, improving productivity for those working without an internet connection. </p><p><b>When this will happen </b></p><ul><li>Targeted Release (Worldwide): Rollout begins in late October 2025 and is expected to complete by late March 2026 (previously late November 2025). </li><li>General Availability (Worldwide): Rollout begins in early April 2026 (previously early January) and is expected to complete by late April 2026 (previously early February). </li><li>General Availability (GCC): Rollout begins in early May 2026 (previously mid-February) and is expected to complete by late May 2026 (previously late February).</li></ul><p><b>How this affects your organization </b></p><p>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. </p><p>This feature will be on or off by default based on your current configuration of the <code>OWAMailboxPolicy-OfflineEnabledWin</code> policy. No changes will be made to existing configurations. </p><p><b>What you can do to prepare </b></p><p>To enable this functionality, ensure the following settings are configured in the new Outlook under <i>Settings </i>&gt; <i>General </i>&gt; <i>Offline</i>: </p><ul><li>Enable offline email, calendar, and people </li><li>Include file attachments</li></ul><p>Admins can manage this feature using the <code>OWAMailboxPolicy-OfflineEnabledWin</code> mailbox policy. Learn more at&nbsp;<a href="https://learn.microsoft.com/powershell/module/exchange/set-owamailboxpolicy" target="_blank">Set-OwaMailboxPolicy</a>.</p><p><i>Caption i. Offline editing can be enabled or disabled in Settings &gt; General &gt; Offline</i></p><p><img src="https://cxcs.microsoft.net/static/public/messagecenter/neutral/5512c4e3-99b6-44f5-b266-6f994f939ded/5c49e703b9acbba35362a284dab2a3567e666d9a.png" style="width: 400px;" alt="Screenshot highlighting toggle to Enable offline email, calendar, and people."></p><p><b>Compliance considerations </b></p><p>No compliance considerations identified, review as appropriate for your organization.</p>

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.

2025-10-28T16:29:07.247Z

<p>Updated October 28, 2025: We have updated the timeline. Thank you for your patience.&nbsp;</p><p><b>Introduction</b></p><p>We’re enhancing offline functionality in the new Microsoft Outlook for Windows. This update (Microsoft 365 Roadmap ID <a href="https://www.microsoft.com/en-us/microsoft-365/roadmap?filters=&amp;searchterms=496371" target="_blank">496371</a>) enables users to add file attachments while composing emails offline, improving productivity for those working without an internet connection. </p><p><b>When this will happen </b></p><ul><li>Targeted Release (Worldwide): Rollout begins in late October 2025 and is expected to complete by late November 2025. </li><li>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). </li><li>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).</li></ul><p><b>How this affects your organization </b></p><p>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. </p><p>This feature will be on or off by default based on your current configuration of the <code>OWAMailboxPolicy-OfflineEnabledWin</code> policy. No changes will be made to existing configurations. </p><p><b>What you can do to prepare </b></p><p>To enable this functionality, ensure the following settings are configured in the new Outlook under <i>Settings </i>&gt; <i>General </i>&gt; <i>Offline</i>: </p><ul><li>Enable offline email, calendar, and people </li><li>Include file attachments</li></ul><p>Admins can manage this feature using the <code>OWAMailboxPolicy-OfflineEnabledWin</code> mailbox policy. Learn more at&nbsp;<a href="https://learn.microsoft.com/powershell/module/exchange/set-owamailboxpolicy" target="_blank">Set-OwaMailboxPolicy</a>.</p><p><i>Caption i. Offline editing can be enabled or disabled in Settings &gt; General &gt; Offline</i></p><p><img src="https://cxcs.microsoft.net/static/public/messagecenter/neutral/5512c4e3-99b6-44f5-b266-6f994f939ded/5c49e703b9acbba35362a284dab2a3567e666d9a.png" style="width: 400px;" alt="Screenshot highlighting toggle to Enable offline email, calendar, and people."></p><p><b>Compliance considerations </b></p><p>No compliance considerations identified, review as appropriate for your organization.</p>

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.

2025-09-23T17:55:58.080Z

<p>Updated September 23, 2025: We have updated the timeline. Thank you for your patience.&nbsp;</p><p><b>Introduction</b></p><p>We’re enhancing offline functionality in the new Microsoft Outlook for Windows. This update (Microsoft 365 Roadmap ID <a href="https://www.microsoft.com/en-us/microsoft-365/roadmap?filters=&amp;searchterms=496371" target="_blank">496371</a>) enables users to add file attachments while composing emails offline, improving productivity for those working without an internet connection. </p><p><b>When this will happen </b></p><ul><li>Targeted Release (Worldwide): Rollout begins in late October 2025 and is expected to complete by late November 2025. </li><li>General Availability (Worldwide): Rollout begins in mid-December 2025 and is expected to complete by early January 2026. </li><li>General Availability (GCC): Rollout begins in mid-January 2026 and is expected to complete by late January 2026.</li></ul><p><b>How this affects your organization </b></p><p>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. </p><p>This feature will be on or off by default based on your current configuration of the <code>OWAMailboxPolicy-OfflineEnabledWin</code> policy. No changes will be made to existing configurations. </p><p><b>What you can do to prepare </b></p><p>To enable this functionality, ensure the following settings are configured in the new Outlook under <i>Settings </i>&gt; <i>General </i>&gt; <i>Offline</i>: </p><ul><li>Enable offline email, calendar, and people </li><li>Include file attachments</li></ul><p>Admins can manage this feature using the <code>OWAMailboxPolicy-OfflineEnabledWin</code> mailbox policy. Learn more at&nbsp;<a href="https://learn.microsoft.com/powershell/module/exchange/set-owamailboxpolicy" target="_blank">Set-OwaMailboxPolicy</a>.</p><p><i>Caption i. Offline editing can be enabled or disabled in Settings &gt; General &gt; Offline</i></p><p><img src="https://cxcs.microsoft.net/static/public/messagecenter/neutral/5512c4e3-99b6-44f5-b266-6f994f939ded/5c49e703b9acbba35362a284dab2a3567e666d9a.png" style="width: 400px;" alt="Screenshot highlighting toggle to Enable offline email, calendar, and people."></p><p><b>Compliance considerations </b></p><p>No compliance considerations identified, review as appropriate for your organization.</p>

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.

2025-08-27T16:21:16.487Z

<p>Updated August 27, 2025: We have updated the timeline. Thank you for your patience.</p><p><b>Introduction </b></p><p>We’re enhancing offline functionality in the new Microsoft Outlook for Windows. This update (Microsoft 365 Roadmap ID <a href="https://www.microsoft.com/en-us/microsoft-365/roadmap?filters=&amp;searchterms=496371" target="_blank">496371</a>) enables users to add file attachments while composing emails offline, improving productivity for those working without an internet connection. </p><p><b>When this will happen </b></p><ul><li>Targeted Release (Worldwide): Rollout begins in mid-September 2025 and is expected to complete by mid-October 2025. </li><li>General Availability (Worldwide): Rollout begins in mid-November 2025 and is expected to complete by late November 2025. </li><li>General Availability (GCC): Rollout begins in early December 2025 and is expected to complete by mid-December 2025.</li></ul><p><b>How this affects your organization </b></p><p>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. </p><p>This feature will be on or off by default based on your current configuration of the <code>OWAMailboxPolicy-OfflineEnabledWin</code> policy. No changes will be made to existing configurations. </p><p><b>What you can do to prepare </b></p><p>To enable this functionality, ensure the following settings are configured in the new Outlook under <i>Settings </i>&gt; <i>General </i>&gt; <i>Offline</i>: </p><ul><li>Enable offline email, calendar, and people </li><li>Include file attachments</li></ul><p>Admins can manage this feature using the <code>OWAMailboxPolicy-OfflineEnabledWin</code> mailbox policy. Learn more at&nbsp;<a href="https://learn.microsoft.com/powershell/module/exchange/set-owamailboxpolicy" target="_blank">Set-OwaMailboxPolicy</a>.</p><p><i>Caption i. Offline editing can be enabled or disabled in Settings &gt; General &gt; Offline</i></p><p><img src="https://cxcs.microsoft.net/static/public/messagecenter/neutral/5512c4e3-99b6-44f5-b266-6f994f939ded/5c49e703b9acbba35362a284dab2a3567e666d9a.png" style="width: 400px;" alt="Screenshot highlighting toggle to Enable offline email, calendar, and people."></p><p><b>Compliance considerations </b></p><p>No compliance considerations identified, review as appropriate for your organization.</p>

Microsoft Outlook for Windows: Add attachments while offline

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.

2025-07-30T23:48:17.270Z

New feature

<p><b>Introduction </b></p><p>We’re enhancing offline functionality in the new Microsoft Outlook for Windows. This update (Microsoft 365 Roadmap ID <a href="https://www.microsoft.com/en-us/microsoft-365/roadmap?filters=&amp;searchterms=496371" target="_blank">496371</a>) enables users to add file attachments while composing emails offline, improving productivity for those working without an internet connection. </p><p><b>When this will happen </b></p><ul><li><b>Targeted Release (Worldwide): </b>Rollout begins in mid August 2025 and is expected to complete by mid September 2025. </li><li><b>General Availability (Worldwide):</b> Rollout begins in mid October 2025 and is expected to complete by late October 2025. </li><li><b>General Availability (GCC):</b> Rollout begins in early November 2025 and is expected to complete by mid November 2025. </li></ul><p><b>How this affects your organization </b></p><p>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. </p><p>This feature will be on or off by default based on your current configuration of the <code>OWAMailboxPolicy-OfflineEnabledWin</code> policy. No changes will be made to existing configurations. </p><p><b>What you can do to prepare </b></p><p>To enable this functionality, ensure the following settings are configured in the new Outlook under <i>Settings </i>&gt; <i>General </i>&gt; <i>Offline</i>: </p><ul><li>Enable offline email, calendar, and people </li><li>Include file attachments</li></ul><p>Admins can manage this feature using the <code>OWAMailboxPolicy-OfflineEnabledWin</code> mailbox policy. Learn more at&nbsp;<a href="https://learn.microsoft.com/powershell/module/exchange/set-owamailboxpolicy" target="_blank">Set-OwaMailboxPolicy</a>.</p><p><i>Caption i. Offline editing can be enabled or disabled in Settings &gt; General &gt; Offline</i></p><p><img src="https://cxcs.microsoft.net/static/public/messagecenter/neutral/5512c4e3-99b6-44f5-b266-6f994f939ded/5c49e703b9acbba35362a284dab2a3567e666d9a.png" style="width: 400px;" alt="Screenshot highlighting toggle to Enable offline email, calendar, and people."></p><p><b>Compliance considerations </b></p><p>No compliance considerations identified, review as appropriate for your organization.</p>