Icon badging not working 7.3 Desktop ?

[sportman12]

I Installed 7.3 Zimbra Desktop I can not get this feature to work
I

Icon badging – To keep you informed, we now display the total number of unread messages across all-inboxes; in the dock icon for Mac and on Windows there’s now a tray icon, which changes to a new mail image if there are unread messages.

Do I have to turn it on in 7.3 Zimbra Desktop is anyone else Icon badging not working ?