We don't have the problem that is described on
http://seer.entsupport.symantec.com/docs/297571.htm
Now I'm getting this warning after the backup...
(Server: "PE-BCK01") (Job: "TEST-Backup Exchange") The job completed successfully. However, the following conditions were encountered:
To support individual mailbox message and folder restores from Information Store backups, you must download and install the Microsoft Exchange Server MAPI Client and Collaboration Data Objects package version 06.05.7888 or later on the Exchange 2007 server. This package can be found on the Microsoft web site.