Your address is probably being spoofed, and the e-mail isn't coming from Hotmail at all. The only way to check this is by looking at the actual internal message headers. Since Hotmail has only a Web interface, it isn't susceptible to viruses and malware, and so it wouldn't be sending e-mails out in your name on its own. Unfortunately, it's very easy to spoof the sender in e-mail. And just as unfortunately, there's nothing you can do about it.