Zimlets Zimlets are a mechanism to integrate ZCS with different third-party applications to enhance the user experience from the Zimbra Web Client. With Zimlets, users can look at information and interact with the third-party application from within their email messages. Zimlets can be made available from the Zimbra Web Client Overview Pane to users by modifying the Class of Service (COS). ZCS includes several predefined Zimlets. You can also create Zimlets or download them from the Zimlet Gallery located on the Zimbra Web site. Predefined Zimlets when enabled let users preview the following: Mouse over a date or time and see what is in calendar. Mouse over a name or email address and see details from the address book for this name. Right-click on a phone number to make a call with your soft-phone. Right-click on a date to schedule a meeting. Right-click on a name, address, or phone number to update address book information. For information about creating Zimlets, see the Zimlet Development section on the Zimbra Wiki.