Create an appointment in Outlook. Save it as an .ics file. Upload that file to your web server. Create a link to that file.

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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
>I want to create a link that can be posted on my company's intranet or in an
> e-mail message that says "add this event to my calendar," without having to
> create a meeting request. I've seen this done on websites, a link that
> automatically drops an event into Outlook. Can this be done in Outlook, or do
> I need another interface?