We believe the recent iOS 6.1 update has been causing problems with our Microsoft Exchange email service. This appears to be caused by an issue with the way that Apple devices such as iPhones and iPads handle meeting requests.
This problems causes a large number of requests to the staff email servers and these can cause performance issues for other users of the service. Those affected can see prompts for usernames and passwords while the offending device repeatedly hits the service. We have seen evidence of this in the access logs on the servers.
On the iOS device itself, the user might see a large number of copies of the same appointment appear, although this has yet to be confirmed.
As a result of these issues we currently do not recommend that you upgrade to iOS 6.1.
If you have already upgraded and have experienced problems then we would recommend that you either:
- power cycle your device or
- recreate the connection with the staff email service
Both of these appear to fix the problem on the iOS device.
If this issue continues to affect the email service, then we will need to look at preventing access to devices that cause problems.
Apple have not yet acknowledged this problem, however further information can be found at: