Exchange 2007 and exchange 2003 co-existence and migration for mobilehttp://blogs.msdn.com/b/jasonlan/archive/2007/02/21/exchange-2007-and-exchange-2003-co-existence-and-migration-for-mobile.aspxOne of my colleague's Vik has written an excellent blog post of the approach you should take when migrating your mobile service to Exchange 2007. It also discusses the features/benefits you will find when you make this change. You can check it out HEREen-GBTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)