Zarafa Professional for ClearOS is an open-source, full-featured collaboration and groupware platform. Zarafa includes a web-based interface for performing mail, address book and calendar functions. Zarafa Professional for ClearOS is MAPI-compliant and can be used as a drop-in replacement for Microsoft Exchange[TM] Server with native support for MS Outlook[TM] mail client. It is designed for organizations that require advanced features such as BlackBerry Support, archiving, automatic updating and high-availability set-ups, combined with the assurance of professional support.
This app includes a license for 20 users. Additional users can be added by purchasing Zarafa user packs from the Marketplace.
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Documentation for ClearOS 6 can be found here.
Documentation for ClearOS 7 can be found here.