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Free Microsoft Exchange Server Alternatives for Linux

Microsoft Exchange Server is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The best free Linux alternative is Kopano, which is also Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Microsoft Exchange Server and 15 are free and available for Linux so hopefully you can find a suitable replacement. Other interesting free Linux alternatives to Microsoft Exchange Server are mailcow: dockerized, Kolab Community, Zimbra Collaboration Suite and SOGo.

Microsoft Exchange Server alternatives are mainly Mail Servers but may also be WebMail Providers or Calendar Apps. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Microsoft Exchange Server.
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  • Windows
  • Online

Microsoft Exchange Server is a messaging and collaborative software product developed by Microsoft. It is part of the...

Learn more about Microsoft Exchange Server

  1. Kopano icon

    Kopano

    • FreemiumOpen Source
    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • Android Tablet
    • Windows Phone
    • iPad
    • Self-Hosted
    • Microsoft Office Outlook
    • S/MIME
    • Software as a Service (SaaS)

    Kopano puts an email, video meetings, calendaring, and file sharing solution within one single interface.

    ⚫︎ Real time collaborationMultiple users can work together in Kopano simultaneously.
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    Kopano vs Microsoft Exchange Server opinions
    Almost everyone thinks Kopano is a great alternative to Microsoft Exchange Server.
    Karunamon

    Free and open source, and has most of the things you want from Exchange, including shared calendars.

    Top positive comment   ago
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    hn1

    Kopano has scalable backend and can do full MAPI server and clientside. The Webapp and Deskapp has intuitive and modern UI/UX.

    Top positive comment   ago
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    marcski

    Stable and cheap backend, flexible frontend support, open source, in full control of your data

    Positive comment ago
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    bobsp

    Scalable, open source with a great UX and it has all the features I need

    Positive comment ago
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    OpenSource, better to maintain, "not Microsoft"

    Positive comment ago
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    -1

    I tried a lot of MS alternatives, OX, Zimbra, Zentyal, but what fits most with Outlook Sync was the new Kopano, it's more flexible. You can use the web app or desktop app too.

    Positive comment ago
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    -1
  2. mailcow: dockerized icon

    mailcow: dockerized

    • FreeOpen Source
    • Linux
    • Self-Hosted

    mailcow is a mail server suite based on Dovecot, Postfix, SOGo, Rspamd and other open source software, that provides a modern Web UI for administration.

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  3. Kolab Community icon

    Kolab Community

    • FreemiumOpen Source
    • Linux
    • Online
    • Self-Hosted

    Kolab is entirely Free and Open Source Software (a.k.a. FOSS), and uses Open Standards. We’ll get to why this is important to us, and hope that it is important to you thereafter.

    ⚫︎ Real time collaborationMultiple users can work together in Kolab Community simultaneously.
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    Kolab Community vs Microsoft Exchange Server opinions
    Most users think Kolab Community is a great alternative to Microsoft Exchange Server.
  4. Zimbra Collaboration is an open, secure collaboration tool for email, calendaring, tasks and more. With the most innovative web application available today, Zimbra boosts the productivity of users on any desktop and dramatically reduces TCO compared to legacy platform vendors.

    ⚫︎ Real time collaborationMultiple users can work together in Zimbra Collaboration Suite simultaneously.
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    Screenshot
    Zimbra Collaboration Suite vs Microsoft Exchange Server opinions
    Most users think Zimbra Collaboration Suite is a great alternative to Microsoft Exchange Server.
  5. SOGo icon

    SOGo

    • FreemiumOpen Source
    • Linux
    • Online
    • Thunderbird
    • Cloudron

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

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  6. OX App Suite icon

    OX App Suite

    • FreeOpen Source
    • Linux
    • Online
    • Self-Hosted
    • Software as a Service (SaaS)

    The OX App Suite by Open-Xchange is web-based platform offering a suite of apps like an email client, calendar, contacts magement, cloud storage with synchronization and productivity apps for word processing, spreadsheets and presentations.

    ⚫︎ Real time collaborationMultiple users can work together in OX App Suite simultaneously.
    ⚫︎ Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
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    OX Portal
  7. iRedMail icon

    iRedMail

    • FreemiumOpen Source
    • Linux
    • BSD
    • Self-Hosted

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

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    Main components and working process
  8. OpenChange icon

    OpenChange

    • FreeOpen Source
    • Linux

    OpenChange aims to provide a portable Open Source implementation of Microsoft Exchange Server and Exchange protocols.

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  9. grommunio icon

    grommunio

    • FreemiumOpen Source
    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Self-Hosted

    grommunio (formerly known as grammm) efficiently combines all requirements of modern, digital communication and collaboration.

    ⚫︎ Real time collaborationMultiple users can work together in grommunio simultaneously.
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    grommunio vs Microsoft Exchange Server opinions
    pros, cons and recent comments
    norbertlambing

    As the first open source solution to offer a full-featured OutlookAnywhere (RPC over HTTP) and MAPI/HTTP implementation, grammm is the alternative to proprietary backends for native interoperability with Microsoft Outlook

    Positive comment ago
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    1
  10. Citadel

    • FreeOpen Source
    • Linux
    • Online

    Is a collaboration suite (messaging and groupware). It is designed to run on open source operating systems such as Linux or BSD.

    ⚫︎ Real time collaborationMultiple users can work together in Citadel simultaneously.
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Showing 10 of 15 alternatives