The second incremental backup of Exchange data to may fail with "Cannot log on to MAPI with the specified credentials." when sent to a Deduplication Storage Folder
Error in the Job log:
0xe00002fe - Cannot log on to MAPI with the specified credentials. (V-79-57344-766)
Error in Remsrv.log
ERROR::RC = -1811 - -1811 The file was not found.
If GRT is required for fulls AND incrementals, backup to b2d. Otherwise disable GRT on the incremental backups to the deduplication storage folder.
This issue has been resolved in Backup Exec 2010 R3.
Exchange 2003 backup to a Deduplication Storage Folder