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A complete collaboration, messaging and e-mail server with Outlook MAPI support.
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A commercial project that allows users to install their favorite Windows apps in Linux
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Easily export and import messages with this add-on for Mozilla Thunderbird
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Allows you to share Outlook calendars and email
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A full installation of Zarafa
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Field-proven, commercial grade email for free
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Brutus is an Open Source connector for Exchange 5.5, 2000 and 2003, to put it short.