My iOS7 calendar on my iPhone 5s continually freezes when I attempt to accept/decline/maybe (respond in general) to any invitations that come through to the device... The main ones I get (so the ones I am experiencing the issue with) are from Microsoft Outlook Exchange Account (also synced through Mail app).
I have attempted to go via the emails I receive with the invitation and the device freezes when attempting to action the request through the Mail app also.
I'm hard reset the phone, I've removed and re-established the account in the phone, but nothing fixes the issue. It might work for one or two invitations, but it will start freezing again without a pattern...
This is a real pain, because these meeting requests etc are for work meetings and interviews!
We are seeing a similuar issue here at work on serveral devices.
Using Lotus Notes for mail and calendar
iPhone 5 and iPhone 5S
Running iOS 7
When an email comes in for a meeting invite if you click on the Date and Time in blue it will walk you through opening the invite in your calendar and then I can Accept/Decline without issue. If you click on the Invitation icon, which seems to be what users intuitively, in the the email then it freezes up the mail app., see image below.
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