Meet Mobile Me
Mobile Me is Apple’s Exchange equivalent, provides push email, contacts, and calendar.
Works with a Mac, PC, and of course the iPhone. Wireless syncing is a go.
Supports Outlook on the PC, and everything on the Mac.
Has web based access to everything through Me.com. Web interface is amazingly slick, probably runs like crap on low-end DSL connections.
$99 a year for 20GB account, free trial available in July.
.Mac is being replaced.