An internal memo sent to employees at a large Fortune 500 company recommends they not update to iOS 6 due to an issue with Exchange, reports MacRumors.
The site has learned that when users decline a meeting invitation on iOS 6 its sends meeting cancellation notices to the entire distribution list instead of just to the meeting organizer, cancelling the invitation for everyone.
Information Technology Notice
To: Mobile device users who connect personal Apple mobile devices (iPhone, iPad, etc) with company email.
What: On September 27, IT notified you of an intermittent issue caused when calendar appointments are declined from devices running the latest Apple operating system (iOS 6). Apple and Microsoft are providing IT with daily updates on their progress toward a resolution.
Impact: When appointments are declined from an Apple mobile device running iOS 6, a cancellation is sometimes sent to all meeting attendees instead of sending a decline notice to the meeting organizer.
Action to take: Do not upgrade your Apple mobile device to iOS 6. If you have an iPhone 5 or have already upgraded a device to iOS 6, please do not accept or decline calendar appointments from your Apple device until further notice.