I was sent this information internally and i thought it was something that was worth sharing.
“Hotmail is seeing instances of accounts being "hijacked" by spammers who send emails out advertising an electronics website. The spam mails usually have subjects like "Good shopping good mood" and may go to your contact list in addition to a random list of emails. Indications that this is happening to you may include you being required to match the characters in the picture (to verify that you're a person and not an automated program) to send mails when you reach your limits.”
“If you believe that someone else has signed in with your Windows Live ID, you should take the following actions to secure your account:
If you still have access to your account, then you should change your password and other information right away by accessing the following links:
You may also want to read Taking control of computer security for more information about general security on your PC