Can't Connect to Exchange Server on Mobile Data

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http://forums.androidcentral.com – I have a very strange problem with my Samsung Galaxy S II. When I have a WiFi connection I'm able to sync all of my mail accounts, Yahoo, Google, & Exchange. When I'm connected to the mobile data network (AT&T) I can sync Yahoo & Google but not Exchange. I have no problem connecting to our exchange server via webmail through my browser while connected on the mobile data network. In my office, I turned WiFi off, opened email and and clicked refresh. My WiFi turned itself back on and connected to exchange. I disconnected from our WiFi network, turned WiFi off again and I got th (HowTos)