calibre
Kovid Goyal · Office
eBook library manager, converter and reader.
Open sourceWindows · Mac · Linux
Mozilla Thunderbird
by MZLA Technologies (Mozilla) · Office, PDF & email
Open sourceWindowsMacLinux
Free email client with calendar, contacts and multiple accounts.
Opens thunderbird.net, MZLA Technologies (Mozilla)'s own site. No mirror, no bundle.
Overview
What is Mozilla Thunderbird?
Thunderbird manages several email accounts in one place with a unified inbox, calendar, contacts, filters and OpenPGP encryption.
Key features
- Multiple accounts and unified inbox
- Calendar and tasks
- Message filters
- Built-in OpenPGP encryption
Best for
- Managing several mailboxes
- Offline email archives
- Encrypted email
Included in starter kits
Install
How to install Mozilla Thunderbird
- 1Open the official Mozilla Thunderbird download page on thunderbird.net.
- 2Pick the build for your system (Windows, Mac, Linux; check x64, ARM or Apple silicon where offered).
- 3Run the installer and read each screen; decline anything you did not ask for.
- 4Keep it updated from the app's own updater or your package manager.
Install from the command line
Windows · winget
winget install --id Mozilla.Thunderbird -e --source wingetMac · Homebrew
brew install --cask thunderbirdLinux · Flatpak (Flathub)
flatpak install flathub org.mozilla.Thunderbird
Package IDs checked against the public winget, Homebrew and Flathub repositories on 1 Nov 2026. Build a script for several apps.
Safety
Download Mozilla Thunderbird safely
Check the domain
The real download lives on thunderbird.net. Look-alike domains and search ads are the most common trap.
Skip mirrors
Download portals can wrap installers in adware or old versions. You never need them for this app.
Verify if you can
If the publisher lists a checksum, compare it with our in-browser checker before running the file.
Watch the installer
Untick extras, browser changes or trials you did not ask for.
Alternatives
Mozilla Thunderbird alternatives
Other office, pdf & email apps, closest platform match first.
LibreOffice
The Document Foundation · Office
Free office suite with a word processor, spreadsheet and presentations.
Open sourceWindows · Mac · LinuxONLYOFFICE Desktop Editors
Ascensio System · Office
Free office editors with a familiar, tabbed Microsoft Office-style interface.
Open sourceWindows · Mac · LinuxAdobe Acrobat Reader
Adobe · Office
Adobe's free PDF reader for viewing, signing and commenting.
FreeWindows · MacMicrosoft 365 (Office)
Microsoft · Office
Word, Excel, PowerPoint and Outlook as a subscription.
PaidWindows · MacSumatraPDF
Krzysztof Kowalczyk · Office
Tiny, fast PDF, ePub and comic reader for Windows.
Open sourceWindows
FAQ
Mozilla Thunderbird questions
Where can I download Mozilla Thunderbird safely?
Download Mozilla Thunderbird only from MZLA Technologies (Mozilla)'s official site at thunderbird.net. Avoid mirror and "download portal" sites, which can bundle extra software with the installer.
Is Mozilla Thunderbird free?
Yes. Mozilla Thunderbird is open-source software and free to use.
Does Mozilla Thunderbird work on Windows, Mac and Linux?
Mozilla Thunderbird is available for Windows, Mac, Linux. Check MZLA Technologies (Mozilla)'s download page for exact system requirements and whether your processor (x64, ARM or Apple silicon) is supported.
Can I install Mozilla Thunderbird from the command line?
Yes, with winget on Windows (winget install --id Mozilla.Thunderbird -e); Homebrew on Mac (brew install --cask thunderbird); Flatpak on Linux (flatpak install flathub org.mozilla.Thunderbird). Package managers fetch the publisher's files and make updates easy.
What are good alternatives to Mozilla Thunderbird?
See the alternatives section on this page and the full office, pdf & email list on AltFTool, which shows each app's licence and platforms side by side.