One of the latest Windows Mobile 6.5 builds for the XPERIA X1 on XDA that I'm running has the Text Message sync option when you set up an Exchange server, but it doesn't yet seem to be working, probably because Exchange 2010 isn't out yet.
Wireless messaging lets you receive special text messages about Movie Miguel directly on your cell phone! We will let you know about The Movie Miguel Show, Dj Movie Miguel, TV appearances, events, special announcements, and other information that you just can't live without. You can unsubscribe at any time. To sign up, just enter your cellphone number and hit submit! Standard text message rates apply.