Outlook inbbox empties and comes back


I’m seeing a weird issue here. Some users Outlook inboxes disappear. Closing and reopening Outlook re-populates the inbox. Some users state they see the same issue using SOGo, but I have not been able to duplicate this single report. I use Thunderbird and have never had an issue.

When the Inbox emails disappear, users can see them being removed from oldest email to newest.

I can’t see anything in the log files.

Any ideas what I can do to track this down?