Thanks for the heads-up. I don't think this will be a problem since GnR directly implements enhancements for this scenario (right?). That is:
Bug 23336 - Admin should get email on meeting requests sent to boss and
Bug 36481 - Support delegate accept/decline in Outlook/ZCO.
But if I read correctly, the workaround in
[SOLVED] Dealing with meeting confirmations isn't going to work anymore in 6.0 since 19898 only provides a filter for invites. I'll need a filter for invitation acceptance/decline messages. Should I file an RFE?