See here for some suggestions:
http://www.slipstick.com/calendar/olpubcal.htm

Signature
Milly Staples [MVP - Outlook]
Post all replies to the group to keep the discussion intact. Due to
the (insert latest virus name here) virus, all mail sent to my personal
account will be deleted without reading.
After furious head-scratching, timbellawine asked this group:
| I am using Outlook 2003 and I would like to be able to post my
| calendar on our FTP site using Outlooks Free/Busy feature. I am
| having trouble configuring the publishing location in Outlook.
For information on free/busy publishing, see
http://www.slipstick.com/outlook/share.htm#ifb . If you have problems, post
back with details on error messages and other symptoms.

Signature
Sue Mosher, Outlook MVP
Author of
Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
>I am using Outlook 2003 and I would like to be able to post my calendar on
> our FTP site using Outlooks Free/Busy feature. I am having trouble
> configuring the publishing location in Outlook.