Since all other Groove features work on 64-bit systems, I’ll assume that you
are asking about Groove File Sharing workspaces, which synchronize unaltered
Windows folders, rather than storing content within Groove.
Groove File Sharing for 64-bit systems will be not supported in the Office
2007 version, as far as I know. We have had a lot of requests for this
functionality, and it is under consideration for future versions. If your
company has an account manager (whether technical or sales) at Microsoft, I
expect that would be the person to ask about putting you in touch with a
product manager.
If encryption during transmission is not a requirement, you might want to
consider Live Mesh, or if you do not want the content stored on Microsoft
servers, Live Sync.
Links:
https://www.mesh.com/Welcome/overview/Overview.aspx
http://sync.live.com
From a quick web search, I also found a comparison of them:
http://www.labnol.org/internet/compare-windows-live-sync-mesh-and-skydrive/6166/
