Great tip! Thanks.

Thanks dude! I was just looking for something like this! Cool!

Thanks man. Short and simple and high on Google. God bless you!

thanx man. just what I was looking for!

Thanks for the tip!!! I use text for all my accounts but, like you, I need to do html compose periodically to embed a picture inline. Shift - Write is perfect.
Btw, this page is Google hit 1 for: thunderbird compose switch to html

argh!!! thank you, thank you, thank you, thank you, thank you. I have tried tool bar buttons etc. but this is sooo easy!!

Thanks! It also works when clicking on forward, what I just needed.

Thaaaank you! I was suffering so long without it!...

Great tip, thanks!!!

Ahh, thanks dude, you are awesome :-D (And your post is still No 1. in Google for the terms "thunderbird switch html" ;)

Super great tip, I wish I took the time to search for this earlier.

I've been faffing around with the accounts settings for years now switching back and forth. Glad there's a much easier way!

This is great - i am exactly the same: prefer plain, but sometimes...

• but for ime it does not work with the "new message button" or "reply". it does works through File > New > Message

(ver Thunderbird 7.01)

I already knew that one but came here through Google by searching for a way like the-mailer-that-must-not-be-named :-) handels this: switching between modes when you already wrote a message before you send it. But there doesn't seem to be a way so it's copying of all text and mail adresses, close the mail, open a new one with that HTML trick and paste everything in there. If someone knows a better way, feel free to post :-)

Wow, this is great. This was exactly the most annoying thing in Thunderbird for me. I need it only very seldom, like every second month, but anyway...