I know of at least one group of people who us a web-based personal calendar as a group calendar. It can be a bit confusing because, for obvious interface design reasons, there's no "inform me of updates" function (after all, if it's designed as a personal calendar, who is there to inform?), but it's turned out to be a highly useful tool for determining when and where to set meetings. And this is only a rather small step from the web-based office, of which a number of examples are already available ... for a price.

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