Outlook Web Access (OWA): Emails duplicated after moving to folder

Mail[German]A small note for administrators whose users are using OutlookWeb Access (OWA) and are now complaining that emails that have been moved to other folders are suddenly appearing there several times. A reader has informed me that Microsoft is aware of the problem and is working on a fix. The fix has been rolled out.

MaxM then came across Microsoft's Office 365 admin portal, where Microsoft describes the problem, in the form of the EX809748 alert. The entry states:

User impact: Users may be unable to move folders in shared mailboxes using Outlook on the web.

Scope of impact: This issue may impact some users who are served through the affected infrastructure and are attempting to move folders in mailboxes using Outlook on the web.

So exactly the above error, users cannot move folders in shared mailboxes under Outlook Web Access (OWA). Regarding this issue, Microsoft is said to be working to analyze the problem "…continuing our efforts to isolate the source of impact, which would help determine our next steps." Anyone affected by this issue?

Addendum: The issue seems to be fixed by Microsoft, they wrote:

Jul 12, 2024, 6:28 AM GMT+2

The fixed build has finished saturating the affected environments. We've reached out to some affected users to confirm the impact has been remediated.

Root cause: A previously deployed build resulted in an error which, while performing the move operation, instead copies email to the target folder and doesn't remove the item from the source folder.

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