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Front: [office365] Message Attachment Size Limit Error

Affected components: O365

Timeline of updates

1. investigating2025-04-17 13:15 UTC

   We received reports from a small number of customers that some drafts error when sending, with the message: "Unexpected problem sending attachment larger than 3MB to Office 365."

2. investigating2025-04-17 18:47 UTC

   Office 365 servers may sometimes fail to accept attachments larger than 3 MB. As a temporary alternative, we suggest using another method of sharing files with recipients, such as OneDrive. We have communicated the issue to Microsoft and are investigating additional mitigations.

3. resolved2025-04-22 21:56 UTC

   There has been a significant reduction in the number of failures for Office 365 requests with attachments larger than 3 MB. We will continue to monitor.

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