PST file names using ExMerge

I'm using the ExMerge utility to migrate mailboxes to a new server.  The mailboxes all backup fine with no errors, but when I tried the restore on the new server, 11 of the mailboxes were aborted.  When I examined the logfile I discovered that these 11 users were backed up with strange PST file names.

Rather than a file named USERNAME.PST these few had extra numbers in the name so they looked like USERNAME22375602.PST - all of the accounts in question have 8 numbers added before the .PST.

When the restore runs, it polls Active Directory to get the usernames and then adds the .PST on, so the restore looks explicitly for USERNAME.PST.  When it doesn't find that match it aborts that particular mailbox.  I've been told that an acceptable workaround is to just rename the .PST files to remove the extra numbers, but I have not been able to find out what wold cause these mailboxes to be named this way in the first place.

Some possible suggestions I've heard are that the mailboxes were changed somehow since they were created, either a username change or they were detached fro the mail store.  I'm hoping that someone who understands this process better than me can shed some light on these file names and what is significant about the 8 extra numbers.
firststarAsked:
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gupnitCommented:
Hi,
You do not even need a rename, just link PST to respective Mailboxes and import PST into Mailbox. I would recommend that you go ahead and do that first.
As far as Numbers in name is concerned I am stumped. But in any case it should not affect the import process.
Let me do some research on that.
Cheers
Nitin
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firststarAuthor Commented:
Thanks for the feedback, I didn't think I could link the mis-named PST file since the restore process seems to automatically look for USERNAME.PST.  I will continue researching too.
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gupnitCommented:
Well use one PST at a time and link it to correct Mailbox. Who says it does not work.
It is a pretty straight forward process
Cheers
Nitin
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firststarAuthor Commented:
Have you been able to find anything further on the 8 extra characters in the PST file name?
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gupnitCommented:
Hi,
Not yet.....I had talked to some others, but they are stumped too.
General consensus is use ExMerge per pst for single mailbox since you said it is only 7-8 usrs
Thanks
Nitin
PS: Hunt is on!!
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