For a long time I've been bugged by something in Thunderbird. I'd hit reply to someone, and the previous email, when quoted, would turned into long lines. In other words - it wouldn't wrap.
For the heck of it - I went into the Edit menu when on an email like this, and noticed "Rewrap" as an option. It did exactly that - rewrapped. Why didn't I see this months ago?
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I had a similar "duh" moment with the reply below option. It drove me crazy that my replies would always show up below the original message. Then I found the checkbox for that option.
Now if they would only make the address, city, state, and zip selectable to cut&paste when previewing contacts in the address book. AAaaarrrgh!