Sync your Google calendar and contact with your Windows mobile device
Look here ... http://www.google.com/mobile/winmo/sync.html
It's free ! Even if you use an IPhone ;-) (I"m using an HTC Diamond)
Again if you still want full Exchange Sync (Contact,mail,calendar,task) look here :
It's a paid but cheap service !
https://www.exchangeemailhosting.com/