IIS6 and SEF URLs using Joomla 1.5x

There are several steps one must take to get Search Engine Friendly (SEF) URLs to work properly when using Joomla! on Microsoft's Internet Information Server (IIS) web servers. The following instructions should result in functional SEF URLs using Joomla! 1.5 and IIS6. The only caveat is that you need access to the server itself to install the ISAPI filter in step 1, so either you should be hosting your own server (not shared) or leasing a dedicated server from your web host. If you're using shared hosting, you will have to convince your web host to install it for you.