[centrex]

All my users currently see a Yahoo! search box on the top of their screen.

This happens with any theme, i.e. sand, lemongrass, etc., not just the new "yahoo" theme.

At first I thought it's a zimlet, so I disabled "zimbra_local" and "zimbra_search" via the Zimlets menu in the admin UI. I also ensured that these zimlets are not activated for the user's COS, but the thing is still there.

Do I have to undeploy them to get rid of this thing ?

My users don't want it in Zimbra because they use their browser's toolbar for internet searches.