I really liked Windows Home Server myself, but if renaming the product is considered, then let's try a few:

Windows LiveServer Hub (everything MS does has "Live" somewhere these days)
Windows Sharing Center (could be business, could be home, does not matter)
Windows Central (address both business or home)
Windows Homegroup Server (Windows 7 Homegroup concept)
or
something that will sound retro for some people, why not use:

Windows Workgroup Server (old days ;)