When launching the BES manager, you must be doing so from the BESAdmin user account, and not from any domain administrator account, otherwise you will receive an error about connecting to MAPI. If you see this error, back out and make sure you’re logged on as the BESAdmin (which is a local and domain user, non-admin). This is a “feature” of how Microsoft Exchange 2003/2007 operates, and is not a Blackberry ‘bug’…. You will also see the following error in the application event log: Failed to open default message store, result=0x8004011d