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Is there a software (freeware) that allows several people to sync their calendars?

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http://serverfault.com – Is there a software (freeware) that allows several people to sync their calendars I know google has small business services that provides something very similar to this, but I am looking for something that is either open sources or does not cost anything to deploy say for under 15 users (or something to that effect) This can't be that hard can it? I've looked into Exchange server and Google Calendars so far. Obviously This is a premium feature so google does not want to just give it away for free (google.com/enterprise/apps/business/products.html#calendar) Wondering mainly if there's a free (HowTos)