The issue between Apple iPhones and iPads running IOS 6.1 and Microsoft Exchange 2010 has been narrowed down even further. It apparently specifically involves accepting or working with a “recurring” calendar appointment such as “every Monday at 9am” type appointments via the Apple mobile device. Even more specifically it appears to be when an exception to that recurring calendar is made such as, “we meet every Monday, but not next Monday”. That is the trigger that can lead to the meltdown.
Apple has a KB article on the issue: https://support.apple.com/kb/TS4532
If you can identify a person caught up in the issue, the article states that these simple steps will break the churning and protect the Exchange server:
From the iPhone or iPad running IOS 6.1:
- Go to Settings > Mail, Contacts, Calendars
- Select the Exchange account from your Accounts list.
- Turn the switch for Calendars to OFF.
- Wait ten seconds.
- Turn the switch for Calendars back to ON.
Apple promises a fix in a future IOS release. The IOS 6.1.1 release that some people with iPhone 4S models are being offered by their carriers does not fix this Exchange calendar issue. The 6.1.1 update relates to other IOS 6.1 caused reliability issues that iPhones had using 3G voice and data networks.