Mail will not open on Thunderbird after successfully installed it on my new iPAD. Thuderbird icon appears on home window of the iPAD; it has a 63 on it, showing messages to be viewed. When I click on that icon a window opens: at top of that window is ACCOUNT ADDED. Below that is MAIL. The control tab for that Icon is in the open position (i.e., slid to right showing green on left). When I click on that MAIL, nothing happens. Also, on the window with Mail, are three other options: Contacts, Calendars, and Notes. Mail and Contacts are the two that show they are in open status. Calendars and notes is in the closed position.