Thunderbird 91.9.0


Thunderbird is a free, open-source, cross-platform application for managing email and news feeds. It is a local (rather than a web-based) email application that is powerful yet easy-to-use. Thunderbird is developed, tested, translated and supported by the folks at Mozilla Corporation and by a group of dedicated volunteers. Thunderbird gives you control and ownership over your email. There are lots of add-ons available for Thunderbird that enable you to extend and customize your email experience.

Thunderbird gives you IMAP/POP support, a built-in RSS reader, support for HTML mail, powerful quick search, saved search folders, advanced message filtering, message grouping, labels, return receipts, smart address book LDAP address completion, import tools, and the ability to manage multiple e-mail and newsgroup accounts.

Changes in Thunderbird 91.9.0:

  • A warning is now displayed if an OpenPGP key has unsafe attributes that are ignored; See support article.


  • OpenPGP integration in Thunderbird 91.8.0 and 91.8.1 did not allow SHA-1 key signatures
  • macOS disk image graphics updated
  • CalDAV calendars were marked read-only on startup
  • Task creation field on macOS incorrectly displayed a search icon
  • Various security fixes

Download: Thunderbird 91.9.0 for Windows (EN/US) | 32-bit | ~50.0 MB (Open Source)
Download: Thunderbird 91.9.0 for Linux (EN/US) | 71.9 MB
Download: Thunderbird 91.9.0 for Mac OS (EN/US) | 119.0 MB
Download: Thunderbird 91.9.0 in other languages
View: Thunderbird Website | Release Notes | Screenshot

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