Tip: Manage Outlook Auto Mapping with Full Mailbox Access
A tip from Ronen Gabbay on how to manage Outlook's Auto Mapping with Full Mailbox Access feature
One of the nicest, time saving but "slightly annoying" features in Microsoft Outlook 2010 and 2013, when working with Exchange 2010 and 2013, is the automatic connection of Mailboxes to which we have been granted access to. Microsoft Outlook will display these mailboxes without us having to do anything at all. This feature will also display said mailboxes when the user has been granted Full Mailbox Access as a delegate using the Exchange Management Console or Website.
That being said, one day a student of mine approached me claiming that his Microsoft Outlook took forever to load and complete a synchronization cycle. Upon closer examination of his workstation, I noticed that his Microsoft Outlook had dozens of connected mailboxes, showing as a result of him having permissions assigned to them. By default, not only are the additional mailboxes displayed in Microsoft Outlook but they also get synchronized locally. While this behavior was initially meant to save us the trouble of manually connecting to these mailboxes, it can become a burden if for some reason there are more than a few.
To properly control this behavior you can use a few PowerShell commands, a detailed explanation can be found in this TechNet Article.
Also, don't forget that each additional mailbox is also cached locally. This can be changed with the modification of the Windows Registry. The KB article on the subject is available here.