Rated 5 out of 5 stars

Second only to QuickFolders this is the add-on that I have most use. And now I find that it is not available on TB5.
I don't understand why TB developers do not build in the possibility of of modifying the Subject line of received emails. It was a feature in Outlook long ago, but Outlook had some significant problems.
I get many emails that arrive with inadequate subjects, which I need to change to help me discover important emails more quickly.
At present I have to go through the "Edit message as new" just to change the Subject line. And I don't need to change anything else.
Anyway, this gets top marks for usefulness from me.

This user has a previous review of this add-on.