Tying the Exchange and Windows Mobile 6.5 even closer together, the two new versions of the software will feature SMS integration, meaning SMS messages will be automatically synchronized back to your Exchange server, where they can be easily searched and archived.
Further features will be the ability to send SMS messages directly from Outlook.
Read more about the new features in Exchange 2010 here.
Via the Windows Phone Guy blog.
Thanks Robert Graff for the tip.