Using Zimbra Tags and Outlook Categories In your Zimbra account, Outlook Categories are identified as tags. In Outlook, you can assign categories to email messages, contacts, tasks, and appointments. These categories are synchronized to your Zimbra account and are identified as tags when viewing your account from the Zimbra Web Client. You can use tags to organize and find particular items. You can apply more than one tag to an item. 1. To browse your account by category, go to your Zimbra mail folder in the ZCO Navigation pane 2. Select Search Folders>Categorized Mail. The mail is displayed grouped by category in the Content pane.