My MM experience has been great so far. email, Cal, Contacts syncing to iphone/ipad/imac. Keep seeing the message to upgrade the Cal portion of this? Has anyone done this yet? Any issue? or is this more of a, if it works fine now, why risk it type of thing. I remember when the Cal upgrade was beta and I had a minor problem, when I called MM they said, the beta was not supported so I reverted back at that point.