Need assistance resolving errors when restoring Mailbox Store

We have a user whose inbox contents have mysteriously disappeared.  This was my 1st mailbox recovery, but seemed pretty straightforward.  Recovery Storage Group - Mailbox Store already existed and is currently unmounted.  Selected correct media set and Mailbox Store in Backup Exec.  Selected Settings - Exchange and unchecked all but Commit after restore completes and Mount database after restore.  Following are the Exchange Server Event logs generated after Backup Exec runs and fails.  Any help?

1.
Event Type:      Error
Event Source:      MSExchangeIS Mailbox Store
Event Category:      General
Event ID:      1087
Date:            12/5/2007
Time:            3:22:35 PM
User:            N/A
Computer:      EXCHSERV
Description:
The information store was restored from an offline backup.
 In the Microsoft Exchange System Manager, indicate that the database "Recovery Storage Group\Mailbox Store (EXCHSERV)" is allowed to be restored to, so that it can be patched.

For more information, click http://www.microsoft.com/contentredirect.asp.

2.
Event Type:      Error
Event Source:      MSExchangeIS
Event Category:      General
Event ID:      9519
Date:            12/5/2007
Time:            3:22:35 PM
User:            N/A
Computer:      EXCHSERV
Description:
Error 0x3f3 starting database "Recovery Storage Group\Mailbox Store (EXCHSERV)" on the Microsoft Exchange Information Store.

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Data:
0000: 46 61 69 6c 65 64 20 74   Failed t
0008: 6f 20 63 6f 6e 66 69 67   o config
0010: 75 72 65 20 4d 44 42 00   ure MDB.

3.
Event Type:      Error
Event Source:      MSExchangeIS
Event Category:      General
Event ID:      9518
Date:            12/5/2007
Time:            3:22:35 PM
User:            N/A
Computer:      EXCHSERV
Description:
Error 0x3f3 starting Storage Group /DC=com/DC=molienergy/CN=Configuration/CN=Services/CN=Microsoft Exchange/CN=Molienergy/CN=Administrative Groups/CN=man/CN=Servers/CN=EXCHSERV/CN=InformationStore/CN=Recovery Storage Group on the Microsoft Exchange Information Store.
MDB failed to start.

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4.
Event Type:      Error
Event Source:      ESE BACKUP
Event Category:      Callback
Event ID:      904
Date:            12/5/2007
Time:            3:22:35 PM
User:            N/A
Computer:      EXCHSERV
Description:
Information Store (2876) Callback function call ErrESECBRestoreComplete ended with error 0x000003F3 The configuration registry key could not be opened.
.

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5.
Event Type:      Error
Event Source:      ESE BACKUP
Event Category:      Restore
Event ID:      950
Date:            12/5/2007
Time:            3:22:35 PM
User:            N/A
Computer:      EXCHSERV
Description:
beremote (368) Unexpected file system error 2 encountered while opening the restore environment file.

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6.
Event Type:      Error
Event Source:      Backup Exec
Event Category:      None
Event ID:      57922
Date:            12/5/2007
Time:            3:22:35 PM
User:            N/A
Computer:      EXCHSERV
Description:
An error occurred while registering a database restore with Microsoft Exchange Server \\EXCHSERV\Microsoft Information Store\First Storage Group.
 Error code: 0x00000002
 Error message: Recovery  

 For more information, click the following link:
http://eventlookup.veritas.com/eventlookup/EventLookup.jhtml