Zarafa is described as 'Open Source Collaboration, providing integration with your existing Linux mailserver, native mobile phone support, Outlook "Look & Feel" webaccess and stable Outlook sharing (100% MAPI)' and is a Mail Server in the office & productivity category. There are more than 10 alternatives to Zarafa for a variety of platforms, including Linux, Windows, Self-Hosted, Web-based and Android apps. The best Zarafa alternative is Zimbra Collaboration Suite. It's not free, so if you're looking for a free alternative, you could try iRedMail or OpenChange. Other great apps like Zarafa are Microsoft Exchange, Axigen, Citadel and CrossBox.
Xeams is a secure and powerful mail server for that includes a powerful spam filtering engine that eliminates up to 99% of junk email right out of the box. The software offers a flexible approach to email, making it a very user friendly server.
DeskNow is a fully featured and easy to use mail and collaboration server with build-in antivirus and antispam. SyncML for mobile devices is separately licensed.
Afterlogic Aurora is an enterprise collaboration system for small and medium-sized business. Aurora provides collaboration of webmail, contacts, calendar, files and helpdesk modules.
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