Shoutbox

Every time you sign in to Messenger 2011 your name will change to your real name, so you'll have to chang it back in 2009 each time if you want your nickname there. If you sign in with 2009 and 2011 simultaneously, not sure what happens, it may be the same as crossing the streams.

But even if you only use 2009, your contacts will still see your real name as long as they are using 2011. Best thing is to just set your "real name" to something you are comfortable with.