The original Outlook doesn't support HTML e-mail services nor even IMAP services. Outlook is more like an "organiser" with e-mail support, it's got calendars, diary and such stuff.
Use "Outlook Express", it's bundled with Windows 98 onwards. It's part of the Windows Components in your Add/Remove Programs.
Outlook Express is a great e-mail client not only supporting POP3, SMTP but also HTML and IMAP.
When configured properly it's very efficient and secure. For instance, automatically check & download your e-mails at user-defined intervals, automatic deleted items removals, attach your "Business Card" that is read by windows address book and the ability to have multiple user profiles and password protection.