Environment: W2003/E2003 with BE 9.1 Build 4691
The backup of the Information Store completes correctly, but the individual mailbox backup fails in many different places with a message stating that it is unable to connect to the IS.
It stops the Information Store completely and corrupts the Exchange DB.
Security has been double and triple-checked, and we have already tried to run the job after shutting off all third-party services that access the IS.