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sɛur Eyal Rozenberg di March 28, 2008 · aseɣwen yezgan

This extension has been effectively abandoned by its author for almost 2 years, without significant updates. It is also not free software, so the code cannot be used elsewhere.

For this reason I have fully rewritten a dupe removal extension of my own, which is actually free software:

Remove Duplicate Messages (alternate)
https://addons.mozilla.org/en-US/thunderbird/addon/4654

It has seen more active development, has a richer feature set (which proerly includes the features of this extension) and for which issues can be opened on Mozdev's bugzilla and addressed within a reasonable amount of time.