Emails missing in Outlook folders (MS Exchange Shared Mailbox)

A user is complaining that emails are missing from some folders in his secondary mailbox. The mailbox in question is another user's Office 365 mailbox attached via auto-mapping (by giving the first user full access permissions).

After a quick check, all affected folders appeared to have a "Filter applied" label showing in the bottom left of Outlook (instead of the number of items).

MS Outlook - Filter Applied

Double-clicking on the "Filter applied" label, shows the Outlook Filter dialogue where I found IMAP Status equals Unmarked filter applied. Removing this filter from the affected folders resolved the issue.

IMAP Status equals Unmarked

October 2022
Windows 10 Home
Microsoft Office 365
Microsoft Exchange Mailbox

 

 

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