I **think** support for SP2 may be imminent. If it is then well done Symantec. I have release down as 20th October -- 55 days ago -- the magic number is 60.
Yes I have, both in lab and production environments. It works just fine.
You will need to reinstall the EVault frontend and backend components on your Exchange servers after the upgrade. The web forms folder path used by the Evault is changed by Exchange SP2. The reinstall places the EVault forms in the new location.