Thunderbird 91.1.0

Thunderbird

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 91.1.0:

VCard attachments now sent with "text/vcard" instead of "text/x-vcard"

Fixes

Thunderbird registered Accessibility Handlers using same GUIDs as Firefox, causing performance issues for NVDA users
Focus lost when reordering accounts by keyboard in the Account Manager
Account setup did not use provider display name for setting up calendars
Various theme and UX fixes
Various security fixes