Most notable among Microsoft Windows Live Sync features:

• 25GB of space
• the ability to sync pretty much any folder on one computer with a folder on another computer

iDisk isn’t even good at multi-computer sync, and the concept of having keeping to local folders in sync via the Internet contracts with Apple’s cloud based folder sync paradigm.  And trust us, when you’re happy with your server’s ability to preserve your data yet unwilling to throw it onto the net in an exposed fashion this is a big selling point.

David Pogue covers Microsoft’s Live Sync service, and the upcoming Mesh, in more detail here.