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.
An Archive feature similar to the one in GMail
Lightning fast search
Thunderbird 68.3.0 changelog:
Message display toolbar action WebExtension API
Navigation buttons are now available in content tabs, for example those opened via an add-on search
“New email” icon in Windows systray changed from in-tray with arrow to envelope
Icons of attachments in the attachment pane of the Write window not always correct
Toolbar buttons of add-ons in the menubar not shown after startup
LDAP lookup not working when SSL was enabled. LDAP search not working when “All Address Books” was selected.
Scam link confirmation panel not working
In Write window, the Link Properties dialog wasn’t showing named anchors in context menu
Calendar: Start-up failed if the application menu is not on the calendar toolbars
Chat: Account reordering via drag-and-drop not working on Instant messaging status dialog (Show Accounts)
Various security fixes
When upgrading from Thunderbird version 60 to version 68, add-ons are not automatically updated during the upgrade process. They will however be updated during the add-on update check. It is of course possible to reinstall combatible add-on via the Add-ons Manager or via addons.thunderbird.net.
Mozilla Thunderbird 68.3.0
Mozilla Thunderbird 52.9.1
Mozilla Thunderbird 17.0.9 ESR（企业版）
Mozilla Thunderbird 3.1.20