Mozilla Thunderbird Portable Edition is the popular Mozilla Thunderbird email client bundled with a launcher as a portable app, so you can take your email, address book and account settings with you. You can also add in GPG and Enigmail to encrypt and sign your email.

Is Thunderbird free?

Yes, Mozilla Thunderbird is free and open source. You can use it for personal and commercial use. However, Mozilla is open to donations in order to keep improving the app.

Does Thunderbird let users make a local copy of my messages?

Yes, Thunderbird will keep a copy of all your messages on your computer by default. You can also create a local backup of your messages or download them from your server whenever you need it.

Can Thunderbird replace Outlook?

For general email use, yes, Thunderbird can be a suitable replacement for Outlook. Those that require better integration with Microsoft Office and Exchange will be more satisfied with Microsoft Outlook. Additionally, Thunderbird's interface may not be as polished as Outlook's.

How many email accounts can I have with Thunderbird?

Thunderbird has no limitation on the number of email accounts users can add to the app.

What mail services does Thunderbird support?

Thunderbird supports most mailing services that synchronize items through the IMAP protocol or download messages through the POP3 protocol. The application also supports synchronization for MS Exchange and accounts. Thunderbird supports Gmail, iCloud,, IceWarp, Microsoft Exchange, Yahoo, AOL, GMX, Kerio and more.


What's New

  • Config setting added to disable OpenPGP "encryption is possible" reminder: mail.openpgp.remind_encryption_possible


  • Thunderbird on macOS will now prompt for Primary Password on startup if set
  • Thunderbird will no longer offer to import OpenPGP keys that are incomplete
  • Selecting or unselecting a dictionary in the Spelling compose toolbar button will no longer immediately close the menu; Making dictionary changes via the editor context menu will continue to close the context menu
  • Contact address lines are now adjusted to appear in the expected order
  • Custom1-4 fields restored to Address Book UI; existing data is preserved from pre-102 profiles