I'm Exchange Server through and through, yet I still use gmail for my personal account. The other day I was forced to re-sync my Windows Mobile and I have now discovered why, Google have added the ability to set security policies on ActiveSync devices (WinMo,iPhone, etc) and remotely wipe them. Cool!
If you are a Google Apps Premier or Education customer head over to, http://googlemobile.blogspot.com/2010/02/bringing-more-administrative-controls.html
Daniel