Skip to content
ToolGPA

Mail-in-a-Box alternatives · Email

Mail-in-a-Box alternatives with a Windows app

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

Mail-in-a-Box is free to use. 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 Mail-in-a-Box

  1. Zimbra

    Self-hosted email, calendar and file sharing for organizations

    • Mail-in-a-Box has a free plan. Zimbra does not.
    • Only Zimbra lists Windows, macOS, Linux, iOS and Android apps.
    • Zimbra also covers tasks.
    Zimbra pricing and details

  2. Proton Mail

    End-to-end encrypted email service based in Switzerland

    • Proton Mail starts at $3.99 per month, billed every 12 months ($47.88); $4.99 billed monthly. Mail-in-a-Box is free.
    • Only Proton Mail lists macOS, Windows, Linux, iOS and Android apps.
    • Proton Mail is end-to-end encrypted, according to its own site.
    • Mail-in-a-Box is self-hostable, according to its own site.
    Proton Mail pricing and details

  3. Thunderbird

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

    • Thunderbird is free. Mail-in-a-Box is free.
    • Only Thunderbird lists Windows, macOS, Linux and Android apps.
    • Only Mail-in-a-Box lists a web app.
    • Mail-in-a-Box is self-hostable, according to its own site.
    Thunderbird pricing and details

  4. Tuta Mail

    End-to-end encrypted email and calendar from Germany

    • Tuta Mail starts at €3 per month, paid yearly (lowest paid personal plan). Mail-in-a-Box is free.
    • Only Tuta Mail lists Windows, macOS, Linux, iOS and Android apps.
    • Tuta Mail is end-to-end encrypted, according to its own site.
    • Mail-in-a-Box is self-hostable, according to its own site.
    Tuta Mail pricing and details

  5. Inbox Zero

    Open source AI email assistant for Gmail and Outlook

    • Inbox Zero starts at $18 per user / month, billed annually ($20 billed monthly). Mail-in-a-Box is free.
    • Mail-in-a-Box has a free plan. Inbox Zero does not, though it has a free trial.
    • Only Inbox Zero lists macOS, Windows, iOS and Android apps.
    • Only Inbox Zero lists a browser extension.
    Inbox Zero pricing and details

  6. Wino Mail

    Free, open source mail and calendar app for Windows

    • Only Wino Mail lists a Windows app.
    • Only Mail-in-a-Box lists a web app.
    • Mail-in-a-Box is self-hostable, according to its own site.
    • Wino Mail also covers templates and tasks.
    Wino Mail pricing and details

  7. Betterbird

    A fork of Thunderbird with extra features and bug fixes

    • Betterbird is free. Mail-in-a-Box is free.
    • Only Betterbird lists Windows, macOS and Linux apps.
    • Only Mail-in-a-Box lists a web app.
    • Mail-in-a-Box is self-hostable, according to its own site.
    Betterbird pricing and details

  8. Axigen

    Mail server with calendars and webmail for Windows and Linux

    • Only Axigen lists Windows and Linux apps.
    • Mail-in-a-Box is open source, according to its own site.
    Axigen pricing and details

  9. MDaemon

    Email server for Windows with webmail and Outlook connector

    • Mail-in-a-Box has a free plan. MDaemon does not, though it has a free trial.
    • Only MDaemon lists Windows and macOS apps.
    • Mail-in-a-Box is open source, according to its own site.
    MDaemon pricing and details

  10. SmarterMail

    Business mail server for Windows and Linux with webmail

    • SmarterMail starts at $550 for Professional with 50 mailboxes; license term not stated. Mail-in-a-Box is free.
    • Only SmarterMail lists Windows and Linux apps.
    • Mail-in-a-Box is open source, according to its own site.
    • SmarterMail also covers file sharing.
    SmarterMail pricing and details

  11. GFI KerioConnect

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

    • Mail-in-a-Box has a free plan. GFI KerioConnect does not, though it has a free trial.
    • Only GFI KerioConnect lists Windows, macOS and Linux apps.
    • Only Mail-in-a-Box lists a web app.
    • Mail-in-a-Box is open source, according to its own site.
    GFI KerioConnect pricing and details

  12. Superhuman Mail

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

    • Superhuman Mail starts at $25 per member / month, billed annually ($30 billed monthly). Mail-in-a-Box is free.
    • Mail-in-a-Box has a free plan. Superhuman Mail does not.
    • Only Superhuman Mail lists macOS, Windows, iOS and Android apps.
    • Only Superhuman Mail lists a browser extension.
    Superhuman Mail pricing and details

27 more that list a Windows app

All 39 in one table

Common questions

Which Mail-in-a-Box alternatives have a Windows app?

Zimbra, Proton Mail, Thunderbird, Tuta Mail, Inbox Zero, Wino Mail, Betterbird, Axigen and 31 more list a Windows app.

Does Mail-in-a-Box have a Windows app?

The Mail-in-a-Box listing does not include a Windows app. It lists Web.

Which of these email apps are free?

Proton Mail, Thunderbird, Tuta Mail, Wino Mail, Betterbird, Axigen, SmarterMail, Spark 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 Mail-in-a-Box: the alternatives its listing names first, then the tools that share the most features with it.