Title: Some users’ email with attachments sent from Outlook for Mac may be delivered without attachments
User impact: Users’ email with attachments sent from Outlook for Mac may be delivered without attachments.
More info: Users can verify if they’ve encountered this problem in Outlook for Mac by reviewing their Sent Items to validate if a sent message contains an attachment. If users don’t see the attachment, they can reply to the message in their Sent Items folder to reattach and send the message again.
Current status: We’re monitoring the deployment of the fix to the affected environments. Based on our current estimate, we expect the fix to be fully deployed by Monday, January 22, 2024. As the deployment progresses, some users may begin to experience relief.
Scope of impact: This issue is specific to a very small percentage of users’ email with attachments sent from Outlook for Mac.
Start time: Monday, July 10, 2023, at 8:08 PM UTC
Estimated time to resolve: We anticipate this issue being fully resolved by Monday, January 22, 2024.
Root cause: A conflict occurring with how our service detects attachment IDs before sending email in Outlook for Mac is resulting in the service removing attachments on sending email.
Next update by: Monday, January 22, 2024, at 9:30 PM UTC
