Diane, most people give fake information to these types of inconsequential account signups. I have never given my real birthdate, name or address to anything other than my online bank or other service providers I know and trust. Even then, I have only ever given my real birthdate to my bank.
The idea that MSN needs this info is laughable. They only want you to create an account so that they can track your searches and provide you with targeted advertising. I would advise to never give details this personal to an account which is just for fun. Especially given the growing occurrences of company's servers being hacked or harddrives of personal data stolen. Just make something up.
It's also advisable to create a free gmail/yahoo/hotmail email address that you just use for this kind of thing- so that you won't get spam to your MAIN email address.
Yes, a little paranoid, but with good reason (oh the stories I could tell!).
