Apple has admitted that iOS 6.1, for which an update was issued earlier this week, still contains a flaw that causes problems for Microsoft Exchange servers.
The 6.1.1 update fixes a problem affecting the iPhone 4S and 3G networks in iOS 6.1 that was so serious that some carriers had warned customers not to update. But Exchange users who did update also found that battery life on the iPhone shortened considerably and Exchange Calendars behaved strangely. According to MacUser’s sister site, PC Pro, this caused the iPhone to ‘excessively ping Exchange servers’ and had led some companies to block the iPhone temporarily.
In a support note acknowledging the issue, Apple said ‘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.’ This, said the company might lead to ‘increased network activity or reduced battery life on the iOS device’ and could result in ‘the server blocking the iOS device.’
The issue affects iPhones running 6.1 connecting to Exchange 2010 SP1 or later or the Office 365 version.
Apple didn’t say when an update to fix the problem would be available. It offered this advice in the meantime: ‘you can avoid this bug by not responding to an exception to a recurring event on your iOS device. If you do experience the symptoms described above, disable then re-enable the Exchange calendar on your iOS device.’