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Microsoft has announced that Outlook for Windows users will soon be able to add file attachments to emails while offline, sending them as soon as internet connectivity is restored. When this feature was announced last July, the General Availability completion date was expected for February, however, this is delayed now until April-May 2026 with the Targeted Release beginning at the end of this month.
This feature is tagged as MC1125491 on the Microsoft 365 Admin Center and as Roadmap ID 496371 on the M365 Roadmap. By letting users add attachments, even when there is no internet connection, will make Outlook for Windows function like other office applications (such as Google Docs) that allow you to do most of your work, even when offline.
With the updated schedule, the Targeted Release for Worldwide customers will be complete by late March, the General Availability (Worldwide) will be complete by late April, and then the GCC General Availability will be complete by late May. Microsoft published this updated schedule on March 9.
This change will affect users with offline mode enabled. In the new Outlook for Windows, users 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. The feature may be on or off by default, depending on your current configuration of the OWAMailboxPolicy-OfflineEnabledWin policy. The update will not affect any existing configurations.
To enable this functionality, you should ensure several settings are properly configured in Outlook. Under Settings > General > Offline, enable offline email, calendar, and people and ensure “Include file attachments” is toggled on. Admins can manage this feature using the aforementioned policy.
This feature will be extremely useful for anybody who wants to work on the go or live in a country with unpredictable power outages as it will allow you to at least get more work done while you wait for the internet to come back.
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