Discussion: Messaging application takes 15-20 seconds to open!

Messaging application takes 15-20 seconds to open! I've had this phone for a week as my company has decided to move us to WM instead of BB (cheaper data costs). I loved the BB 7130e I had prior to this s720, but I have been getting used to the WM interface and find it pretty good except for 1 major problem. Every time I want to launch the messaging application to read a new email, it takes 15-20 seconds before the message headers will display. Can anyone point me toward a potential fix. We use real-time wireless synch with Exchange 2003 and Telus email on the go application.