The Remote Sync client can synchronize with a SyncML Server over the network. If you can find a SyncML Server for your desktop PC, and make it accessible on the Internet, and also make it work with Outlook, you could.
The SyncML Server products I'm aware of are for server-side solutions for companies or operators, but not for desktop use.
A cheaper option: Buy a Bluetooth or infrared adapter for your desktop PC, too.