I've been a Windows Mobile user for years, and have relied steadily on Nuevasync, a free service that provides synchronizing of Calendar/Contacts info via Exchange ActiveSync to your Google account.

I configured my N900 to NuevaSync's service last night but couldn't get it working. NuevaSync appears to be seeking testers with N900's in order to produce a fix. I've registered my interest in helping them out, and others might wish to do so in order to speed progress towards a workable solution.

Best,

digittante