Export mailbox from 2010 (sp3) and import into 2007 Sp3 rollup 10

Question

I have no issue exporting the mailbox from 2010.  
The issue is importing into 2007.  I have a 2003 32 bit server with outlook 2003 sp2 running etc.  Every time I try to import I get the below error.  Is this even supported?
I've scoured the web, tried fixmapi, added permissions, different switches, etc.  The pst attaches fine to the mailbox without issues.
[5/15/2014 8:15:51 AM] [0] [2007import2] Opening Exchange mailbox.
[5/15/2014 8:15:51 AM] [0] [ERROR] Error was found for 2007import2 ([email protected]) because: Error occurred in the step: Approving object. An unknown error has occurred., error code: -2147221219
[5/15/2014 8:15:51 AM] [0] [2007import2] The operation has finished.
Any help or sugesstions would be great!

Answer 1

Steve I see that Belinda suggests that this may be a bug and that you are on SP3, however it may be that you need to update your systems completely to see if the issue is resolved.  To be able to find the actual patch level you are on you would need
to follow the steps below.  Once you know your actual patch level you can either just update to the latest and greatest and try again OR read through the various fixes for each patch newer then what you have applied
1.    This is the link for the Exchange Server Build #'s including Service Packs 
http://social.technet.microsoft.com/wiki/contents/articles/240.exchange-server-and-update-rollups-builds-numbers.aspx
a.    Only thing you will not find in this list are the IU (Interim Update #’s) because they are unofficial patches to fix specific issues and then must be uninstalled before moving on to the next RU, CU or SP.
2.    To find the SP, RU, CU level that your server is on use this Powershell command.  
GCM exsetup |%{$_.Fileversioninfo}
EXAMPLE 1:  Below is the result from a server with 2010 SP1 RU6 installed and you will see this referenced in the above link
Product Version         File Version          File Name
14.01.0355.002           14.01.0355.002   C:\Program Files\Microsoft\Exchange Server\V14\bin\ExSetup.exe
EXAMPLE 2:  Below is the result from a server with 2010 SP1 RU6 installed WITH an IU from MS and you will not see this version referenced in the above link but it is sequential, i.e. SP1 RU6 is .002 and the IU is 003.  So in short by looking at this
and the above link you could easily infer that this system has SP1 RU6 with some type of IU installed.
ProductVersion   FileVersion      FileName
14.01.0355.003   14.01.0355.003   C:\Program Files\Microsoft\Exchange
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