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 OpenChange Alternatives ranked by AI · updated May 2025
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OpenChange is an open-source implementation of Microsoft Exchange server protocols. It allows interoperability with Microsoft Exchange servers for email, contacts, calendars, and tasks.
Price: Free
🎯 github.com/openchange/openchange
Top 6 OpenChange alternatives
2
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
3
Scalix is a Linux-based email and groupware server that includes email, contacts, calendar, and mobile connectivity.
Pros
- Outlook compatibility
- Mobile device support
Cons
- Paid subscription required for certain features
ProtonMail is an end-to-end encrypted email service based in Switzerland.
Free tier available, premium plans starting at $5/month
Google Workspace is a suite of cloud computing, productivity and collaboration tools, software and products developed by Google.
Starting from $6/user/month
Roundcube is a browser-based multilingual IMAP client with an application-like user interface.
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