Neowin reports that passwords of 20,000 hotmail, live and msn accounts have been compromised. It is unclear whether the passwords were obtained through a hack or phishing scheme. A list containing the account credentials was posted by an anonymous user on a public forum at pastebin.com.

It appears that currently only accounts starting with the letters A-B are affected, but other lists could exist.

I suggest that you change your password on your msn, hotmail or live account just to be safe.