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how do I delete duplicate e-mail addresses?

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When we got new computers at work, we had to switch to Thunderbird e-mail. After our new computers were uploaded with our old computers data, I noticed I now have 4 duplicate copies of each e-mail address in my address book. Is there an easier way to remove the duplicates other than manually selecting each one?? I have over 600 e-mail addresses in my address book and now there are 4 more of each. This will take forever to manually delete them.

When we got new computers at work, we had to switch to Thunderbird e-mail. After our new computers were uploaded with our old computers data, I noticed I now have 4 duplicate copies of each e-mail address in my address book. Is there an easier way to remove the duplicates other than manually selecting each one?? I have over 600 e-mail addresses in my address book and now there are 4 more of each. This will take forever to manually delete them.

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This add on claims to help you search out duplicate contacts. https://addons.mozilla.org/en-US/thunderbird/addon/duplicate-contact-manager/?src=ss