By default, at the top of your Zimbra 5.x webclient, there is a Yahoo search bar present. I never use Yahoo to search, so i don’t want it. I also don’t want my webgui cluttered with Yahoo nonsense. Since 5.0.2 however, you can remove it by executing the following commands on your zimbra server console:

# su – zimbra

# zmprov mc default zimbraFeatureWebSearchEnabled FALSE

When you reload the webinterface, the Yahoo search bar is gone :)