Rated 5 out of 5 stars
My company recently transitioned to Gmail and got rid of Outlook. I was looking for a way to make my replies and forwards in Thunderbird behave the way they did in Outlook. This add-on (along with ReFwdFormatter) did exactly what I needed and more.
Also, the support is amazing. When the last release had a bug, it was fixed within a day of me reporting it and I was emailed a patched copy of the add-on.