I've had a similar problem and it turns out that it could be caused by Eset Endpoint Security. It's also worth noting that in my experience this only happens with mailboxes configured in Outlook via IMAP on more than one PC (sometimes 5 or more Outlooks at the same time).
https://forum.eset.com/topic/40888-dete ... ame-email/
https://forum.eset.com/topic/33024-outl ... conflicts/
https://forum.eset.com/topic/34659-eset ... -messages/
If you are experiencing this problem and are using Eset, try temporarily uninstalling it on all PCs connected to the mailbox affected by this problem (and probably re-add the IMAP account to Outlook as well).
If you don't use Eset, please add your detailed experience here so that we can rule it out as a possible cause.
https://forum.eset.com/topic/40888-dete ... ame-email/
https://forum.eset.com/topic/33024-outl ... conflicts/
https://forum.eset.com/topic/34659-eset ... -messages/
If you are experiencing this problem and are using Eset, try temporarily uninstalling it on all PCs connected to the mailbox affected by this problem (and probably re-add the IMAP account to Outlook as well).
If you don't use Eset, please add your detailed experience here so that we can rule it out as a possible cause.
Statistics: Posted by mocha — Tue Jan 28, 2025 6:04 pm