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 OX Open-Xchange Alternatives ranked by AI · updated May 2025
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OX Open-Xchange is a leading provider of open-source email and productivity software solutions.
Price: Contact for pricing
🎯 open-xchange.com
Top 6 OX Open-Xchange alternatives
Microsoft Exchange is a popular email and calendaring server solution by Microsoft.
Starting from $4 per user/month
Roundcube is a browser-based multilingual IMAP client with an application-like user interface.
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
Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.
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