Microsoft has posted a support document explaining how to work around trouble with Exchange support in iOS 6.1
. "When a user syncs a mailbox by using an iOS 6.1-based device, Microsoft Exchange Server 2010 Client Access server (CAS) and Mailbox (MBX) server resources are consumed, log growth becomes excessive, memory and CPU use may increase significantly, and server performance is affected," the company begins
. "Additionally, Office 365 Exchange Online users receive an error message that resembles the following on an iOS 6.1-based device: 'Cannot Get Mail The connection to the server failed.'"