We've got a couple of users who are having an issue with mail syncing between their mobile device, laptop and desktop PC.
The situation is this:
Users in the office are on "online mode" in Outlook
Users with laptops are in "cached mode" on their laptops.
What we're seeing is that a minimized Outlook window at the office (in Online Mode) will not update while the user is at home. Once they get into the office and start using Outlook, it takes about 5 minutes for Outlook client to sync with the changes (like marking read messages as read/populating with new mail).
Outlook isn't closed, it's just minimized overnight.