Kopano Alternatives

Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.

A fully fledged, free email server solution, an open source project (GPL v2).

Warm up your cold email inbox, and never land in spam anymore!

Try for free freemium $9.0 / Monthly

Kolab Groupware is a secure, scalable, reliable, flexible, full-featured collaboration suite.

SOGo is groupware server with a focus on scalability and open standards.

Google's encompassing suite of cloud-based business apps.

Open-Xchange Server 6 is the most advanced Linux based Groupware solution f.

An open source mailserver suite.

Web-based IMAP email client

Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft.

Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online

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Microsoft Teams provides the enterprise-level security, compliance and management features you expect from Office 365, including broad support for compliance standards, and eDiscovery and legal hold for channels, chats, and files.