I also use Ms since getting divorced....no way do I want to be called Mrs anymore. I did use Ms for a while in the early 70's....it was a way for a woman to be seen as an individual......NOT an extention of a man.
i was told that 'mrs' implied that you were the property of your husband.... and 'miss' implied you were property of your father.... and since i learned that i have been a 'ms'