I changed password on email to prevent the hacker

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For couple of months, my hotmail account was compromised. Someone else hacked into my email account, and use it to send out millions of unsolicited advertising materials. My friend inquired me about this matter, and I told him about it. I also noticed someone intended to write weird email to all my contacts, and he left a draft. I want to notify this problem with hotmail administrator, but it seems that I couldn't find any contact information to Hotmail technical personnel. The final step is to change my password. It works, and now I don't see the similar problem happen again. I just wonder if there is problem worst than your email account is compromised, how would you contact hotmail technical department for help?