How do I restore a single mailbox from and exhange 2003 server to an exchange 2007 server using back up exec?

I recently inherited this network.  The original exchange server was on the dc.  The dc was a windows 2003 server with exchange 2003 using back up exec 11d as a back up solution.  I need to restore a mailbox from this server onto their new mail server, which is a windows 2003 server running exchange 2007. The dc is still the same server, back up exec is still being used, exchange 2003 has been removed from the dc, and exchange is being back up remotely.  The mailbox i need to restore belongs to a user that no longer is present.  The back up tape I'm using is from their year end, thus it's pre-exchange 2007.  I've created the recovery storage group on the exchange 2007 server and followed the item in symantecs knowledge base article #277633. But I'm still receiving the same error:

0xe000848c - Unable to attach to a resource. Make sure that all selected resources exist and are online, and then try again.

I think it has something to do with the fact that I'm trying to restore from an "old" exchange server.  But I can't pin it down. So my question is, how do I restore a single mailbox from an exchange 2003 server to an exchange 2007 server?  Any help would be appreciated...  Thank you in advance.
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patelbg2001Connect With a Mentor Commented:

The Exchange 2007 RSG does not support mounting mailbox databases from previous versions of Exchange Server.

RonNAuthor Commented:

Thanks for the insight... Looks like I got my answer.  I appreciate the help.
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