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I cannot get a list of addresses when I whant to send, or forward an email like I use to?

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Thunderbird no longer displays my contact list when I want to send or forward an email.

Thunderbird no longer displays my contact list when I want to send or forward an email.

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In a Write window you can press F9 to bring up the Contacts Sidebar.

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Open the 'write' window as if you are going to compose an email. Then click on the View menu and make sure that 'contacts sidebar' is ticked -- or you can press F9 to enable it.