We've had a problem on company iPhones where the phones would constantly connect to the exchange server and attempt to resend emails that were unsent or had an issue sending the first time. This dramatically increased data usage and reduced battery life on each phone. I came across a website that could help with this issue:
The problem is, I am unsure of how to follow the directions listed in the link. Could anyone help out? Also, does anyone know if this issue has been resolved in the new iOS 7?