Yeah my sister does that too but it usually causes a lot of problems nowadays, like constant "unable to send/receive message to all reciepients" and junk.
More reasons why new MSN fails:
Lack of bullets when messaging, no toggability at all:
Horrid new emoticons with no way to revert but to make them into custom emoticons one by one, and even then, impossible to use same emoticons with same codes (IE, can't use :P any more to show the old MSN's :P):
You have to deal with this now any time you click a link in an MSN conversation:
Often times you get this and are forced to copy/paste the link into your browser, making much more un-needed effort: