Thunderbird 91.2.0


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 91.2.0:

  • Saving a single message as .eml now uses a unique filename


  • New mail notifications did not properly take subfolders into account
  • Decrypting binary attachments when using an external GnuPG configuration failed
  • Account name fields in the account manager were not big enough for long names
  • LDAP searches using an extensibleMatch filter returned no results
  • Read-only CalDAV calendars and CardDAV address books were not detected
  • Multipart messages containing a calendar invite did not display any of the human-readable alternatives
  • Some calendar days were displayed incorrectly or duplicated (eg. two "29th" days of a particular month)
  • Phantom event was shown at the end of each day in Calendar week view
  • Various security fixes

Download: Thunderbird 91.2.0 for Windows (EN/US) | 64-bit | ~50.0 MB (Open Source)
Download: Thunderbird 91.2.0 for Linux (EN/US) | 65.2 MB
Download: Thunderbird 91.2.0 for Mac OS (EN/US) | 119.0 MB
Download: Thunderbird 91.2.0 in other languages
View: Thunderbird Website | Release Notes | Screenshot

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