If you’re just mucking about with IIS, you don’t really want to pay a CA to get a legit certificate, do you?
No, of course you don’t. Fortunately these guys have a freebie certificate generator. Mucho handy.
Just don’t even think about using it in production code.
Oh, and don’t get the page to email you the certificate to a mailbox you can only look at via Outlook. Outlook’s dumbarse “protecting you from shadows” attachment filter won’t let you at the CER certificate file that comes through.