We have a 2016 RDS terminal server environment. We set Outlook to work for all users off of cached Exchange mode, but no we can see that some users are missing unread emails that are older than a week. To explain it another way, whenever the click on their Unread view they are only seeing emails from the current week and not past weeks. If they then search for a user under Unread they see all the unread emails from that user.
Do you know what could be causing this?