Currently Being ModeratedSep 14, 2012 5:56 PM (in response to Intoodeeptosleep)
I get pretty much this same error.
I have an iPhone 4S & iPad2. I have two email accounts configured, both as exchange: One is my Gmail account. The other is my work account (we have an Exchange 2007 SP2 server at work). My default Calendar is my work exchange account. My default contacts are my Gmail contacts, and my default send account is my Gmail account. This is a personal phone but i like to be able to skim my work email when I'm away from desk or commuting.
When both devices were on iOS 5.0 (and other releases before 5.1.1) if I accepted invitations into my PC desktop Outlook, my calendar would sync correctly to both the iPhone and iPad. If I accepted the invitation on the iPhone it would display the Calendar invitation error: "Your response to the invitation cannot be sent", the add the meeting to my calendar and sync correctly to all devices. However if I accepted them on my iPad, then I got the Calendar invitation error: "Your response to the invitation cannot be sent" on the iPad, and i'd get a greyed out entry on my Calendar. This entry would not sync to other devices. Once I accepted the invitation in Outlook then there would be two entries on the iPad and one would stay greyed out. Very annoying.
Now that i've upgraded both iOS devices to the latest 5.1.1 I cannot accept any invitations, and after the error prompt goes away, I don't even get the greyed out invite on my calendar. The entire request disappears! Which is even worse! Now I can easily miss appointments & meetings. Not sure what is happening.
I'm thinking of removing my work account and syncing only my personal invites to Gmail calendar instead.
Hope someone can help on this issue. I've search the forums and the web extensively and haven't read any solutions. I'm getting my IT to install the latest SP and rollup fixes onto our work Exchange server first to see if that will help.
Currently Being ModeratedNov 15, 2012 3:22 AM (in response to Intoodeeptosleep)
I have the same problem with my iPhone 5 iOS 6.0.1 using a Exchange Google Apps account for the Calendar.
When I receive a Calendar Invitation and press "Accept" the iPhone says "Calendar Invitation. Your reponse to the invitation cannot be sent." and is in grey.