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Open-Xchange alternatives · Email

Open-Xchange alternatives with a Windows app

The Open-Xchange listing does not include a Windows app. 39 of the 125 other email apps in this directory list a Windows app.

Open-Xchange's current pricing could not be confirmed from its own site. 25 of them are free or have a free plan.

39 tools · Listings checked up to Nov 13, 2026 · Where the facts come from

The 12 closest to Open-Xchange

  1. Zimbra

    Self-hosted email, calendar and file sharing for organizations

    • Only Zimbra lists Windows, macOS, Linux, iOS and Android apps.
    • Zimbra also covers tasks.
    Zimbra vs Open-XchangeZimbra pricing and details

  2. IceWarp

    Business email, chat, files and meetings, cloud or self-hosted

    • Only IceWarp lists Windows, macOS, iOS and Android apps.
    • Open-Xchange is open source and self-hostable, according to its own site.
    • IceWarp also covers team chat, video calls and file sharing.
    IceWarp vs Open-XchangeIceWarp pricing and details

  3. Inbox Zero

    Open source AI email assistant for Gmail and Outlook

    • Only Inbox Zero lists macOS, Windows, iOS and Android apps.
    • Only Inbox Zero lists a browser extension.
    • Inbox Zero also covers chat assistant, inbox filtering and workflow automation.
    • Open-Xchange also covers calendar.
    Inbox Zero pricing and details

  4. Wino Mail

    Free, open source mail and calendar app for Windows

    • Wino Mail has a free plan. Open-Xchange does not.
    • Only Wino Mail lists a Windows app.
    • Only Open-Xchange lists a web app.
    • Open-Xchange is self-hostable, according to its own site.
    Wino Mail pricing and details

  5. GFI KerioConnect

    Self-hosted business mail server with calendar, chat and local AI

    • Only GFI KerioConnect lists Windows, macOS and Linux apps.
    • Only Open-Xchange lists a web app.
    • Open-Xchange is open source, according to its own site.
    • GFI KerioConnect also covers shared inbox.
    GFI KerioConnect pricing and details

  6. Superhuman Mail

    Keyboard-driven email client for Gmail and Outlook with built-in AI

    • Only Superhuman Mail lists macOS, Windows, iOS and Android apps.
    • Only Superhuman Mail lists a browser extension.
    • Open-Xchange is open source and self-hostable, according to its own site.
    • Superhuman Mail also covers booking links.
    Superhuman Mail pricing and details

  7. Spark Mail

    Email client with a unified smart inbox, AI tools and team features

    • Spark Mail has a free plan. Open-Xchange does not.
    • Only Spark Mail lists macOS, Windows, iOS and Android apps.
    • Only Open-Xchange lists a web app.
    • Open-Xchange is open source and self-hostable, according to its own site.
    Spark Mail pricing and details

  8. Proton Mail

    End-to-end encrypted email service based in Switzerland

    • Proton Mail has a free plan. Open-Xchange does not.
    • Only Proton Mail lists macOS, Windows, Linux, iOS and Android apps.
    • Proton Mail is end-to-end encrypted, according to its own site.
    • Open-Xchange is self-hostable, according to its own site.
    Proton Mail pricing and details

  9. Microsoft Outlook

    Microsoft's email and calendar app for desktop, mobile and web

    • Microsoft Outlook has a free plan. Open-Xchange does not.
    • Only Microsoft Outlook lists Windows, macOS, iOS and Android apps.
    • Open-Xchange is open source and self-hostable, according to its own site.
    • Microsoft Outlook also covers tasks and inbox filtering.
    Microsoft Outlook pricing and details

  10. Thunderbird

    Free, open-source email app for Windows, macOS, Linux and Android

    • Thunderbird has a free plan. Open-Xchange does not.
    • Only Thunderbird lists Windows, macOS, Linux and Android apps.
    • Only Open-Xchange lists a web app.
    • Open-Xchange is self-hostable, according to its own site.
    Thunderbird pricing and details

  11. Zoho Mail

    Ad-free business email hosting with calendar, tasks and notes

    • Zoho Mail has a free plan. Open-Xchange does not.
    • Only Zoho Mail lists macOS, Windows, Linux, iOS and Android apps.
    • Open-Xchange is open source and self-hostable, according to its own site.
    • Zoho Mail also covers tasks.
    Zoho Mail pricing and details

  12. Tuta Mail

    End-to-end encrypted email and calendar from Germany

    • Tuta Mail has a free plan. Open-Xchange does not.
    • Only Tuta Mail lists Windows, macOS, Linux, iOS and Android apps.
    • Tuta Mail is end-to-end encrypted, according to its own site.
    • Open-Xchange is self-hostable, according to its own site.
    Tuta Mail pricing and details

27 more that list a Windows app

All 39 in one table

Common questions

Which Open-Xchange alternatives have a Windows app?

Zimbra, IceWarp, Inbox Zero, Wino Mail, GFI KerioConnect, Superhuman Mail, Spark Mail, Proton Mail and 31 more list a Windows app.

Does Open-Xchange have a Windows app?

The Open-Xchange listing does not include a Windows app. It lists Web.

Which of these email apps are free?

Wino Mail, Spark Mail, Proton Mail, Microsoft Outlook, Thunderbird, Zoho Mail, Tuta Mail, Canary Mail and 17 more are free or have a free plan.

When was this checked?

Each listing shows its own date. On this page they run from Oct 4, 2026 to Nov 13, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.

This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to Open-Xchange: the alternatives its listing names first, then the tools that share the most features with it.