Hi, this might be a bit off topic, but maybe not, if we end up writing the software ourselves...

Where I work we're currently using a very old version of the webevents web-based calendar. We want to replace it with a new system. If we don't find something ready-made, we'll probably develop a new one ourselves, but would prefer to purchase something.

Does anyone know of a really good web-based calendar product that interfaces with Exchange and Active Directory? We're looking for a package to purchase, not a hosted solution.