I'm also looking for a solution similar to this. Right now, I'm trying out eGroupWare. I'm not sure what support is in Debian for this, but according to the eGroupWare site, they have been working on this functionality, although the outdated references I've seen to iCalSrv (or something like that) says it's experimental and not for production use. I'll let you know after I explore eGroupWare a little.
Otherwise, I THINK that Outlooks depends on M$ Exchange Server for this functionality and doesn't depend on any open standards (like iCal) to accomplish this, and I've not heard of a package that emulated this. I'm not sure about iCal support in Outlook either. We're trying to use something like Lightning or Sunbird as a calendar app, and they use iCal and can use WebDAV. I've considered setting up WebDAV directories in Apache and seeing if I can set up a makeshift calendar system this way, but I'm sure it would have it's limitations in the sharing department. If there are any debian packages that can handle this, I'd be very interested to know, but I haven't found anything in the stable tree so far. There are many web-based calendaring apps (like webcalendar and egroupware), but I'm not sure if they they can sync w/ a desktop client. Offhand, I've heard that Sun has a java-based calendar server available in Java. I'm sure I could find some GPL software out there to do this, but it's easier to manage servers and updates if there are supported packages in the debian repos. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]