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 IBM Notes (formerly Lotus Notes) Alternatives ranked by AI · updated May 2025
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IBM Notes is a client-server cross-platform application.
Price: Starting from $12 per user/month
Top 6 IBM Notes (formerly Lotus Notes) alternatives
Atmail is a popular email platform that offers secure and customizable email solutions for businesses.
Contact for pricing
OX Open-Xchange is a leading provider of open-source email and productivity software solutions.
Contact for pricing
Kerio Connect is a secure and reliable email and messaging solution for small to mid-sized businesses.
Starting from $4.40/user/month
IceWarp is a comprehensive email collaboration platform that offers email, messaging, and collaboration solutions for businesses of all sizes.
Varies based on the number of users and features selected
Mail server software for Microsoft Windows. Provides email, calendaring, and collaboration features.
Starting from $349
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