Backup keeps running on Exchange Mailboxes

We have a Windows 2003 server running Veritas BE 9.1 to a DLT tape drive.  The backup runs fine each night except for towards the end of the job it stays on running and gives an alert to "remove media from the drive" once that alert is ok'd, it cancels the job.  The job log shows an error under the backing up of the MS Exchange mailboxes that says "the device is not connected"  each time it does this.  We have looked into it and when we remove a certain users mailbox from the backup job, the job runs all the way through and finishes.  When we add that mailbox back into the job, it gets stuck again and gives the error.  The user is not leaving their mailbox open at night and it does this.  Is there a way to set the job to skip this mailbox so that it finishes even when it can't back it up?  It has run fine before with this mailbox in the job, but lately it will not.  

Thanks,
sim2k_supportAsked:
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andyalderConnect With a Mentor Commented:
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simsjrgCommented:
Is the Job Log showing a specific mailbox? Is it possible for you to post the Job Log?
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sim2k_supportAuthor Commented:
No it only shows it under the exchange mailboxes portion, it does not show a specific mailbox, however we thought that this user might be leaving their mailbox open as their email is set up to go to their phone when they are offsite and the job worked with their box eliminated from the job.  However last night, their Outlook was closed and the job still did not finish.
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simsjrgCommented:
Have you checked Event Viewer on the media erver and the Exchange server?
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sim2k_supportAuthor Commented:
There are errors asking to remove the media from the drive once the job has become stuck.  In the job log under exchange mailboxes it shows an error "1-incorrect function, 0x48F device not connected" after the job has already run 21 gb.  We have tried different tapes and cleaning and everything with the media.  
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glenn_1984Commented:
The Exchange backup should not care whether or not Outlook is open.

Have you tried:
Exporting all the email for this user to a .pst file.
Completely KILL/DELETE/ERADICATE the mailbox.
Recreate
Import
Test Backup
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knoxzooCommented:
Have you checked the HDD for errors?
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sim2k_supportAuthor Commented:
I tried the hotfix, but it would not let me install it until I installed BE SP4.  I did that, rebooted, and the job ran through past the mailboxes that were getting stuck before.  It is finishing the job now but saying failed due to skipped files and a remote agent, which we have seen before.
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