I can't find a COS setting for Show a popup notification (requires Yahoo! BrowserPlus). Does it even exist?
One more question: If I set the setting Check for new mail every: to let's say 30 seconds or even less if it is possible, will the server be overloaded with users requests? The server has around 200 active mailboxes. During the working hours users usually leave the web browser open at their Zimbra mailbox.
Thanks for your help