Free Busy not posting to FTP

I can't seem to understand why Outlook 2002 will not post
to the ftp folder on the local iis webhost. Is there
anyone that has successfully set this up that can help me?

I've read the KB
http://support.microsoft.com/default.aspx?scid=kb;en-
us;291621 about this but doesn't help.

Thanks, Mild Red