That's because of the evolution-2.2 compatibility desktop shipped with the package for people upgrading (the version used to be written to the panel configuration which is an user setting and is not modifiable on upgrade)
** Changed in: evolution (Ubuntu) Status: Unconfirmed => Confirmed -- there are multiple menu entries for evolution in a new edgy install https://launchpad.net/bugs/57628 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs