Data Protection for Exchange is supported on Windows Server 2008 x64 now.
This was added as part of the Data Protection for Exchange 5.5.1 release
Here is the technote showing this:

        http://www-01.ibm.com/support/docview.wss?&uid=swg21297052

Here is the link to the FTP site that has this version:


ftp://ftp.software.ibm.com/storage/tivoli-storage-management/maintenance/tivoli-data-protection/ntexch/v551/

Thanks,

Del

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"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> wrote on 10/24/2008
05:07:22 AM:


>
> Will Exchange 2007 will be supported on a 64-bit Windows 2008 server
>
> simroz
>
> to:
>
> ADSM-L
>
> 10/24/2008 08:18 AM
>
> Sent by:
>
> "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
>
> Please respond to ADSM-L
>
> Dear All,
>
> I have been trying to find an official answer from IBM when Data
> Protection for Exchange 2007 will be supported on a 64-bit Windows
> 2008 server.
> There is 2008 64-bit support for the BA client, and Exchange 2007
> TDP support for Windows 2003, however I do not see TDP support for
> Exchange 2007 on Windows 2008.
>
> If anyone has any information please send it my way, this is holding
> up a current project and I an running out of time to find an answer.
>
> Thanks in advance.