Im in the process of UAT testing a 9860 for a client on Exchange but when i send a meeting invite, it comes to the device as an email and you can only 'reply' etc. and not 'accept or decline'. Running 4.1.7 on the BES and tests on other devices for calendar invites is fine, so definitely an issue with the 9860.
Testing calendar invites from 2 different exchange accounts and 1 domino.
9860 Calendar Issue
