> have never used any group-based calendars.)
> 
> Does anyone know of an open source Outlook-compatible group calendaring
> system?

the biggest mistake people are doing here is trying to find something
"like windows" , "like word" , "like outlook group calendaring system.."
instead of searching for program that will do job they want.
 
> Or a similar working/reliable alternative?
> 
> Thanks,
> 
>    Jeremy C. Reed
>    http://www.reedmedia.net/
>