Zimbra is an enterprise-class email, calendar, and collaboration solution built for the cloud, both public and private.
Starting at $6 per mailbox per year
Best Scalix Alternatives ranked by AI · updated May 2025
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Scalix is a Linux-based email and groupware server that includes email, contacts, calendar, and mobile connectivity.
Price: Paid
Top 3 Scalix alternatives
OpenChange is an open-source implementation of Microsoft Exchange server protocols. It allows interoperability with Microsoft Exchange servers for email, contacts, calendars, and...
3
Kopano is an open-source groupware software suite including email, calendaring, tasks, and file sharing.
Pros
- ActiveSync support
- Modern web interface
Cons
- Paid version required for certain features
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