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address book has disappeared

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When I open Mozilla Thunderbird on the top bar all I have now are the pin symbol, Unread, contact,Tags and attachment. I no longer have the option to write email or look in my contacts . Also main settings option is no longer at top right hand corner. This all seemed to happen when Thunderbird upgraded itself.

When I open Mozilla Thunderbird on the top bar all I have now are the pin symbol, Unread, contact,Tags and attachment. I no longer have the option to write email or look in my contacts . Also main settings option is no longer at top right hand corner. This all seemed to happen when Thunderbird upgraded itself.

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The universal keystroke for hidden menus is the alt key or F10. One of these two keystrokes should reveal the menu bar. From the menu bar select View-Toolbars and turn on the missing toolbars.

Write and Address Book are on the Mail Toolbar.