iPhones will not connect to Exchange Server on 3G or 4G
I have a company who has been using Exchange Server on their iPhone's for almost a year. Something has changed last weekend and now no one can send/receive E-Mails from exchange over the AT&T 3G or 4G networks. It will work over a Wi-Fi connection. My server is Windows Small Business Server 2011. I've tried removing the account and setting it back up. Any ideas what could have changed?