I'm not quiet sure where to place this question.
Within a web-site projekt I like to inform all registered user about a new
appointment by server side generated email by PHP.
To make it easier for them to add this information into their outlook
system, I'd like to create and attach an outlook calendar element to this
email.

Is this possible and if yes, how. Are there any tutorials or documentations
somewhere online?

TIA
Karsten

Have a look here

http://www.slipstick.com/dev/olforms/holiday.htm

although the form is for holidays, you  should be able to
adapt it for what you want.

Dave