That's what I'm looking for. It has to be free for commercial use and I can put up any kind of server (with any kind of operating system) to run it. We'd like to share microsoft office compatible documents, calendars and tasks, mainly. Http and less client software installation would be a plus. The easier the better. Keeping our email service on our isp server if mandatory.
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Fengoffice is good too (opensource, php) | |||
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There is Zimbra, which has an open source edition. The OSE doesn't have some of the features of the paid versions they offer, but it does seem to have all the features you're looking for. | |||
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