Popular: Data updated November 13, 2026

Categories

Internet1,412
Communication327
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Mozilla Thunderbird alternatives

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

Mozilla Email clients #14 Email clients

12 Windows apps in the same category as Mozilla Thunderbird, ranked by what they have in common and by popularity.

  • Proton Mail Bridge

    Use Proton Mail with your desktop email client

    Open source 3.27.1 26.2K ↓ ★ 1.6K email, mail
  • Tuta Mail

    Tutanota is an email client with a strong focus on security and privacy that lets you encrypt emails on all your devices.

    Open source 368.261109.0 51.6K ↓ ★ 8K email
  • Mailspring

    Boost your productivity and send better email with Mailspring, the best mail client for Mac, Linux, and Windows.

    Open source 1.26.2 7.7K ↓ ★ 17.9K email, mail
  • MFCMapi

    Provides access to MAPI stores to facilitate investigation of Exchange and Outlook issues and to provide developers with a sample for MAPI development.

    Open source 26.0.26291.01 5.7K ↓ ★ 984 email, mail
  • eM Client

    Fast email client with full Gmail, Hotmail and other services synchronisation. Best replacement for MS Outlook or Thunderbird. Free version for Home users.

    Free 11.0.1577.0 98.1K ↓ email, mail
  • Pebble

    A local-first desktop email client for people who want a calmer, more private inbox.

    Open source 0.1.6 ★ 598 email, mail
  • Postbox

    Postbox is the power email app for busy professionals, like you.

    Proprietary 7.0.56 17.5K ↓ email, mail
  • Claws Mail

    The user-friendly, lightweight, and fast email client

    Open source 4.1.1-1 11K ↓ email, mail
  • Prospect Mail

    Unofficial desktop client for Microsoft Outlook

    Open source 1.3.2 592 ↓ ★ 544 email, mail
  • Mailbird

    A powerful, intuitive, ultra-customizable and dead set on mailing

    Proprietary 3.0.63 email, mail
  • Zimbra Desktop

    Zimbra Desktop is a desktop email client that synchronizes your emails even when offline, so your mailbox is updated when you go online.

    Proprietary 4.50.0 9K ↓ email, mail
  • Betterbird

    Betterbird is a fork of Mozilla Thunderbird with additional features and bugfixes.

    Open source 153.7.0 44.3K ↓ email, mail

Comparison

AppLicenceVersionUpdatedGitHub starsChocolatey downloads
Mozilla Thunderbird (en-US) Open source 160.0 November 11, 2026 — —
Proton Mail Bridge Open source 3.27.1 October 8, 2026 1.6K 26.2K
Tuta Mail Open source 368.261109.0 November 10, 2026 8K 51.6K
Mailspring Open source 1.26.2 October 22, 2026 17.9K 7.7K
MFCMapi Open source 26.0.26291.01 October 19, 2026 984 5.7K
eM Client Free 11.0.1577.0 November 12, 2026 — 98.1K
Pebble Open source 0.1.6 November 5, 2026 598 —
Postbox Proprietary 7.0.56 July 19, 2022 — 17.5K
Claws Mail Open source 4.1.1-1 December 8, 2022 — 11K
Prospect Mail Open source 1.3.2 November 7, 2026 544 592
Mailbird Proprietary 3.0.63 August 31, 2026 — —
Zimbra Desktop Proprietary 4.50.0 September 24, 2026 — 9K
Betterbird Open source 153.7.0 November 11, 2026 — 44.3K