It's nice to see Microsoft leading the field in support for 64-bit operating systems.
Windows Home Server Connector, which is the little application installed on the clients which handles backups and opens the Home Server Console, doesn't install on x64.
Officially the team says they don't have the resources to support x64 and so there will be no support at this time.
What I want to know is why Microsoft isn't putting the money into the team to support x64. I don't know about you, but I want the transition to 64-bit completed as fast as possible, that means all vendors pulling their weight writing compatible software. We're running out of RAM fast, there's games around now which chew up over 2GB quite happily, we need to migrate soon. Having Microsoft, who was among the first (with AMD) in the x86 space to start pushing 64-bit dragging their feet with Home Server is somewhat annoying.
You can force the install of the Connector software on x64 by using the following on an elevated command prompt:
msiexec /i \path\to\whsconnector.msi WHSMSI="RUNSETUP"
But backups simply won't function properly, and it is not officially supported. What I would like to see a few months down the road after release is x64 support.
I'd also like to see a stripped down Exchange plug-in for Home Server, with a web front end hooked in to the Home Server web page too.