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Microsoft Exchange is a popular email and calendaring server solution by Microsoft.
Google Workspace is a cloud-based productivity suite that helps teams communicate, collaborate, and get things done. It includes Gmail, Docs, Drive, Calendar,...
Starting from $6/user/month
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
IBM Notes is a client-server cross-platform application.
Starting from $12 per user/month
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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