Rated 5 out of 5 stars

I had caps lock on by mistake.What I wanted to write was this:1.) I was visiting the Soviet Union last July and ABSOLUTELY no Americans were in St Petersburg that day.How it came out was this:2.) i WAS VISITING THE sOVIET uNION LAST jULY AND absolutely NO aMERICANS WERE IN sT Petersburg that day.What TitleCase case gives me with your solution is this:3.) I was visiting the soviet union last july and absolutely no americans were in st petersburg that day.It probably serves a useful function, but when I need it is when the CAPS lock was on by mistake. It doesn't work well for that. My rating is only relevant to my needs. For other needs at may well deserve 5 starsclick previous post by this user below,

Well, I've tried v 2.5.It is just absolutely what I need. Thanks so much.I have this problem more often than I'd like to admit. You solved it for Thunderbird. Five stars! Ever consider making an addon for OpenOffice?

This review is for a previous version of the add-on (2.0). 

You can try out the 2.5 version here with tOGGLE cASE: https://addons.mozilla.org/en-US/thunderbird/addon/titlecase-for-thunderbird/versions/

Rated 3 out of 5 stars

I guess it;s 4 out of 4 saying toggle case is critical before it is highly useful. On my computers it is installed, but disabled until toggle case becomes an option.

This review is for a previous version of the add-on (2.0). 

You can use the "Title Case", "Start Case" and "Proper case" to change it to what you want. What it does is first change all casing to lowercase, than applies the settings. For example: "tOGGLE cASE" will turn into "Toggle Case" if highlighting and pressing ALT + 4. Let me know if that doesn't help and you need it to swap exact casing to the opposite.