I would first consider Openexchange Server, which is an open source collaboration and integration server that offers much of the same functionality you already have under Windows with Microsoft Exchange.
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You can receive professional support from both Novell and Netline, which hosts the Open-Exchange Web page.
Also, you may want to consider Versora to migrate the data from Exchange to OpenExchange Server. Versora offers a full suite of tools for migrating from Windows servers to Linux servers. They specialize in migration from Microsoft Exchange to Open Exchange.
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