BES 12 is out

BlackBerry Enterprise Server 12 is out.

We have a long history with BES in calendar migrations, usually as an indicator of permissions issues.

We're not making any endorsements on upgrading except for the main recommendation we always make in a migration: test the snot out of it beforehand in a lab environment and have a back-out plan.  

You're only dealing with something that has an impact on all of your users here.