Question about email de-duplication software.

Can a Microsoft Exchange expert recommend software to use to merge several exported mailboxes to PSTs. For example; a user has a mailbox exported to a PST from a 6/2008 RSG restore and a PST from a 10/2008 RSG restore and a PST from a  4/2009 RSG, how can I merge the 3 PSTs into one PST and rid of any duplication. I am looking for a software utility I can buy that performs well and easy?
355LT1Asked:
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Britt ThompsonConnect With a Mentor Sr. Systems EngineerCommented:
I've never used it but their Split PST product has been around for a very long time and I've used that in the past with success. I've never personally had the need to merge PST's like this. I suggest downloading a trial of this and maybe a few others and see how they work before committing.
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Britt ThompsonSr. Systems EngineerCommented:
Outlook will do this. Open a profile using one of the PSTs and export it to one of the other PSTs. Choose do not export duplicates. Then, do the same with the remaining PST so everything is combined without dupicates.
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355LT1Author Commented:
I know that. I am looking for a utlity other that Outlook..
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Britt ThompsonSr. Systems EngineerCommented:
If this is Exchange 2007 or 2010 you can do it using Export/Import PST from a 32-bit machine with the Exchange Management Tools installed to/from a mailbox on the server but that's probably just as much work as using Outlook. Here's a utility that will merge PST files:

http://www.pstmerge.com/
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355LT1Author Commented:
I may have to use a 64 bit machine. Is this one of the best 3rd party products on the market for merging multiple PSTs?
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355LT1Author Commented:
Ok thanks, I might try merging 12 at a time.
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