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Open Xchange, (find it here) works marvelous, they have a live demo on their site if you'd like to check it out. It may be a little over-kill though for what you want to do with it (setting up the server is not exactly a walk in the park if you're not a systems guy). But it is free (GPL)

Do the freely downloadable ISO images contain Suse's OpenExchange mail/groupware server?

The other ones seem to lack a bit of pizazz. The two major competitors seem to be the
BillWorkgroup (as in Gates) server and the unencumbered Netline version of OpenExchange which IIRC is derived from the Suse OPX codebase.

Everything else I looked at is crap. I checked out Communigate Pro (a commercial product) and though it looked mostly professional, it had a bunch of features that simply weren't available in Outlook. I'd consider tolerating that from a free software project but not a proprietary offering.

I believe that's the point of Open-Xchange. However, I haven't been able to assertain whether or not the system allows for the type of group scheduling that CorporateTime does. It would seem that the WebDAV protocol would be a bottleneck, but perhaps there's enough backend smarts to make the integration/permissions management of multiple calendars rather seamless.

The mental hurdle that I have with WebDAV systems is how to implement the ability for someone else to add an unconfirmed meeting to your calendar. With WebDAV, it would seem you either have read access (no additions at all), or write access (add anything you want, including confirmed meetings and deleting other meetings). Specialized calendaring protocols can compartmentalize this type of thing.

Rob