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Open source alternative to exchange server

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What's required is an alternative to Exchange Server. That's where the money is that's how you make your customers dependent on your products.

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by apotheon

eGroupWare (at egroupware.org)

OpenGroupware.org (at opengroupware.org)

Open Source Exchange Replacement (at oser.sourceforge.net)

OPEN-XCHANGE (at open-xchange.org)

PHPGroupware (at phpgroupware.org)

and many more (at grantbow.com/groupware.html)

You'll have to figure out for yourself what works for you and what doesn't, of course. The responsibility that goes along with more freedom is more need to research your options. Of course, you could always just continue using whatever product fell in your lap first (probably MS Exchange) without any concern for whether something else might suit your purposes more fully.

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