19. February 2013 22:26
iOS 6.1.2 Fixes an Exchange calendar bug that could result in increased network activity and reduced battery life.
For information on the security content of this update, please visit this website: http://support.apple.com/kb/HT1222
Rapid growth in transaction logs, CPU use, and memory consumption in Exchange Server 2010 when a user syncs a mailbox by using an iOS 6.1-based device
Controlling problematic iOS6.1 devices
How to Block iOS 6.1 ActiveSync Devices from Exchange Server 2010
Apple KB http://support.apple.com/kb/TS4532