I installed the 2012.10.1 update in a test installation with a copy of our production database, and I have had some problems with the ActiveSync (the sync of email's made everything hang, including the phone HTC One S, Android 4.0.1, filed in a bug report). I now deleted the ExchangeServer sync at the phone and redefined it, including new selection of profile for sync, and it now seems as some of the events from the first common calendar is synced (not all of them), and events from the second common calendar is not synced at all. Defined like:
0 => 463,
1 => 464,
in config.inc.php. Fortunately, this about deleting/redefining the ExchangeServer profile at the phone seems to have solved the problem syncing the email's.