After upgrading to ubuntu 12.04, session menu and user menu were missing and the mail menu was empty. I followed the directions in this thread and the session and user menus appeared. But the mail menu is still empty. What can I do to get it working?
I tried these,
sudo apt-get purge indicator-messages
sudo apt-get install indicator-messages
After this the mail menu contents flickered for a second and disappeared again.
NOTE: The mail icon appears in the task bar but it us empty.