we have an Exchange 2010 Server.  On occasion users have had issues with their Outlook client freezing or crashing.  sometimes I believe it is the result of them leaving their Outlook open and then the system shutting down or rebooting.  None the less we have to rebuild databases to quickly get that operational again.  Some users have brought to my attention that under their My Computer folder there are Recovered Folders which appears to hold data from their Exchange mailbox.  What is the program trying to tell us with these Recovered Folders?  Does these folders contain data that was not synced back to the original location within a users mailbox?  Typically I tell a user that it is safe to delete these Recovered Folders since all mail is stored on the server, yet I want to confirm.   I read in a separate discussion that Diane Ross says it is safe yet there was no further explanation as to what they are and why they appear.
please advise.