Hi Brian,
You may want to check with the folks in the MS Office Groove discussion broup on this using the link below.
The Office Server products and the Office desktop app products aren't always targeted to the same platforms.
==================
It has to be a joke. Especially since Groove server only runs on x64, its
clearly the direction of the product.
Now I can't imagine a file sync is world alteringly difficult become the
platform is x64. This is very, very frustrating indeed. <<
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Please let us know if this has helped you,
Bob Buckland ?

MS Office System Products MVP
LINKS
A. MS Office Groove news/discussion group via newsreader software
news://msnews.microsoft.com/microsoft.public.groove
or
MS Office Groove new/discussion group via browser:
http://microsoft.com/communities/newsgroups/en-us/?dg=microsoft.public.groove
B. MS Office Accounting Community discussion/newsgroups via Web Browser
http://microsoft.com/office/community/en-us/default.mspx
or
Microsoft hosted newsgroups via Outlook Express/newsreader
news://msnews.microsoft.com