University of Delaware Information Technologies (IT) recommends that Exchange users not take any action on calendar items or meeting requests using a new iPhone or any other device running iOS6 until the device has been upgraded to iOS6.0.1.
Apple will be pushing this update to clients. IT recommends that UD Exchange users with iOS6 devices download the update over the air with Software Update, or, if necessary, via iTunes or the Apple App store.
The update to iOS6.0.1 also includes important security updates. (Report from Sophos Labs)