Rated 4 out of 5 stars

As Mark B said: March 17, 2025
It sort-of works, but...1. It takes a long time to work, and the dialog doesn't close itself. 2. You end up with TWO COPIES of the email, the original, and the one with the new Subject. 3. It does NOT move the original email into your LOCAL folders

So I do a multistep workaround, because yes, it's INDISPENSABLE.
1. Set it running
2. go to EEs folder (which for me is in a different account!)
3. move new version to desired folder
4. stop the running change (because it will NEVER stop by itself
5. delete the original

Rated 5 out of 5 stars

Great for dealing with subject lines, but it's suddenly stopped functioning. I'm still on Tbird version 115.5.1