I have just installed Zimbra Desktop. When I try to compose new mail, the "to" and "Cc" boxes are greyed out and if I point the cursor at them , I get the unavailable icon. Also, Autocomplete does not work.
Incidentally, when I first installed Zimbra DT, clicking on Address Book sometimes gave me all my addresses in the pane and sometimes the pane was empty. Reinstalling Zimbra seems to have cured that.
I hope there is an easy solution as Zimbra seems to be just what I need.