Apple has announced that it is working on a fix for the Microsoft Exchange bug that has been widely reported by users upgrading to iOS 6.1. The bug which is causing severe headaches for system administrators is said to be caused by a user responding to an exception to a recurring calendar event. This exception is a change to a single instance of a repeating calendar event.
When you respond to an exception to a recurring calendar event with a Microsoft Exchange account on a device running iOS 6.1, the device may begin to generate excessive communication with Microsoft Exchange Server. You may notice increased network activity or reduced battery life on the iOS device. This extra network activity will be shown in the logs on Exchange Server and it may lead to the server blocking the iOS device. This can occur with iOS 6.1 and Microsoft Exchange 2010 SP1 or later, or Microsoft Exchange Online (Office365).
Microsoft released a support article earlier in the week giving iOS 6.1 users with an Exchange account three options to try. The final two options included throttling iOS 6 user’s access to the server or even blocking them from the Exchange Server altogether. It is good to hear that Apple will have a solution coming through although there is no time frame given for the update.
Source: Apple Support Article