Exchange 2010- MailBoxImportRequest

I have a user that after a migration is missing mail due to corruption. I can access the old server offline, open outlook attached to that offline server and create a PST file. Then copy the PST to a thumbdrive, move it to a shared location on a server on the production network and run the following command...

New-MailboxImportRequest -Mailbox USER -FilePath \\EXCHANGE\Public\pst\USER.pst

This all works, I have done it for a couple other machines, but the users had so much corruption that I just wiped out the inbox and started over. This user has some data, just not all of it, that transfered, plus they are also receiving New Email as of today.

the Question:
if I run the above command to import that data, will it overwrite or append to the existing mailbox in use? I'm wanting to append...
350ztnAsked:
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lucid8Commented:
By default, the import checks for duplication of items and doesn't copy the data from the .pst file into the mailbox or archive if a matching item exists in the target mailbox or target archive.  If you wanted to change that you should look at the ConflictResolutionOption http://technet.microsoft.com/en-us/library/ff607310.aspx
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lucid8Commented:
OK a few things


1. What service pack are you on?

2. Run the cmdlet Get-Mailbox <user> | fl RetainDeletedItemsFor to check your retention period on the user in question

Also please note that  "calendar items are maintained in the Recoverable Items folder structure for 120 days.

3. Search-mailbox should do it with the SearchDumpsterOnly and DeleteContent switch

Check out http://technet.microsoft.com/en-us/library/ff678798.aspx and  http://technet.microsoft.com/en-us/library/dd298173.aspx

Search-mailbox -identity <alias> -SearchDumpsterOnly -DeleteContent
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350ztnAuthor Commented:
I actually did an import of the pst file to the users account. Looked liked that works. Does that mean I can delete the pst file now that it successfully imported?
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lucid8Commented:
You certainly could delete the PST, however i would suggest that you archive it somewhere in case a user comes to you and say my xyz is missing and its your fault or or crud i deleted 123 from last year help me....

basically I save everything for several weeks after a situation like this as a CYA....
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350ztnAuthor Commented:
resolved with importing the pst into exchange
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