I introduced a Thunderbird extension to remove duplicate mails yesterday and I want to continue today by writing about a Thunderbird extension that checks for duplicates in the Thunderbird address book. The add-on handles one address book at the time currently which is a little unfortunate but the author promises to deliver the possibility to check all existing address books in a future version.
Duplicate entries can have several reasons. Besides corrupt address book files it can also be that the same contact send you mails from different accounts. You can use the Duplicate Contact Manager to merge those information by adding the second email to the first address book entry and deleting it afterwards.
The add-on can be started by opening the address book in Thunderbird and clicking on the – newly added – Duplicates menu and there on the Find and manage Duplicates entry.
The process takes a while and is semi-automatic. There is no information how the extension compares the address book entries but my understanding is that it compares several variables such as displayed name, first and second name and displays those entries if it finds a match.
This does mean however that you will get lots of matches for popular first names such as John or Mary. Takes a while as well depending on the amount of contacts in your address book.
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