Microsoft Exchange is a popular email and calendaring server solution by Microsoft.
Starting from $4 per user/month
Best Zimbra Alternatives ranked by AI · updated May 2025
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Zimbra is an enterprise-class email, calendar, and collaboration solution built for the cloud, both public and private.
Price: Starting at $6 per mailbox per year
🎯 zimbra.com
Top 6 Zimbra alternatives
Google Workspace is a suite of cloud computing, productivity and collaboration tools, software and products developed by Google.
Starting from $6/user/month
ProtonMail is an end-to-end encrypted email service based in Switzerland.
Free tier available, premium plans starting at $5/month
Microsoft Office 365 is a suite of productivity applications that includes Word, Excel, PowerPoint, Outlook, and more, offered as a subscription service.
Starting from $5 per user per month
Tutanota is an open-source end-to-end encrypted email software and freemium hosted secure email service.
Freemium
Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features.
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