Thunderbird Spell check error?

This is NOT really a pressing problem but more along the line of curiosity. Please don't anyone waste a lot of time on it.

I was typing an email in TB when I noticed that I had spelled I'm as I "m. (Quotes instead of an apostrophe) When the spell checker didn't catch it I checked my personal dictionary thinking that at some time I had added it in error. Nope it wasn't there. I checked pretty much several different things on the Internet and can't find that the one I typed in error was correct. Why would that spelling be in the built-in dictionary?

Thanks.

 

This is spel check test. I'm or I "m. It sems that boath are corect.

I did a test, with intentional errors, and, only I "am was not considered an error.
I*m was also ok. (ok is not)

 

Thanks for the test. <G>

Guess these spell checkers just aren't worth too much.

I did type some words in my MS Works word processor and it was automatically corrected as I watched. Guess Microsoft knows how to spell?