I can connect my AT&T iPhone through exchange to get my company email and haven't had problems. I'm currently running 4.3. My friend has a Verizon iPhone and the exact same setup on her phone is not working. She can get mail but after some time it starts to ask for the password despite it already being in there. It'll ask over and over again despite pulling mail. If she enters her password in after a more than "X" times, she gets locked out of her mail on the phone and her computer. If she doesn't respond to the password questions after a bit, it won't pull her mail. The setup is the same as my AT&T iPhone. Is this a known Verizon iPhone issue? Also, we have people at the company with AT&T iPads and they don't have any problems with their mail either setup the same way.