My address book didn't download onto my new computer

I downloaded Thunderbird when I got my new computer. All my emails came but my entire address book did not. Can anyone tell me how to find it?

We will need some more information before we can help much. Is your new system Windows? Is your old system still operational? Is your email account IMAP or POP3? Was the address book on the old computer or did you use Google Contacts (or some other similar service)?

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