Review for Remove Duplicate Messages by CAS
Rated 4 out of 5 stars
Version 0.1.13, Great, 5 star . Version 0.1.14 OK to a point. Small number of emails to compare, works. Large number of files to compare, it hangs!! Was comparing a folder with 4852 emails.
Hangs. Hope 0.1.14 gets fixed. {Using Thunderbird 38.2.0} on Win 7.
To create your own collections, you must have a Mozilla Add-ons account.