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What free online email providers work with Microsoft Outlook?

What free online email providers work with Outlook? I know that Yahoo! does, but requires a professional subscription, and Hotmail doesn't seem to work either. Any others?

Public Comments

1. Are you doing it correctly? Hotmail works just fine for me, I get all my mail in Outlook.
2. You can use GMail with POP, which I believe works with Outlook (there's no way an e-mail client won't support POP/SMTP). www.gmail.com and sign up. It's constantly increasing in popularity. P.S. Hotmail only works if you got your Hotmail account before a certain date. Now, I believe you have to pay in order to get it working in Outlook.