Here is an Mtext Quick Tip that I am "borrowing" from Cadalyst's latest Tips and Tools Weekly.
Have you ever typed a note in AutoCAD's Mtext editor only to find out that your caps lock was on (or off depending on what you want to accomplish)? There are a few things you can do to fix it. Right click in the editor and select the CHANGE CASE option. Or, press Ctrl + Shift + U to set the text to Upper Case, OR . . . . press Ctrl + Shift + L to set the test to Lower Case.
Very simple but handy.
Happy CADDING!