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Thunderbird is an open source project, which means anyone can contribute ideas, designs, code, and time helping fellow users.
Join UsVersion 60.2.1, first offered to channel users on October 2, 2018
Calendar: Default values for the first day of the week and working days are now derived from the selected datetime formatting locale (restart after changing locale in the OS required)
Calendar: Switch to a Photon-style icon set for all platforms
Multiple requests for master password when Google Mail or Calendar OAuth2 is enabled
Scrollbar of the address entry auto-complete popup does not work
Security info dialog in compose window does not show certificate status
Links in the Add-on Manager's search results and theme browsing tabs open in external browser
Localized versions of Thunderbird didn't show a localized name for the "Drafts" and "Sent" folders for certain IMAP providers (particularly in France)
Replying to a message with an empty subject inserted Re: twice (not working in Thunderbird 60.0)
Spellcheck marks disappeared erroneously for words with an apostrophe (not working in Thunderbird 60.0)
Calendar: First day of the week cannot be set
Calendar: Several fixes related to cutting/deleting of events and email scheduling
Various security fixes
Thunderbird will hang if HTML signature references non-existent image (solution forthcoming)
According to RFC 5721, passwords containing non-ASCII characters are encoded using UTF-8 which can lead to problems with non-compliant providers, for example office365.com
Double-clicking on a word in the Write window sometimes launches the Advanced Property Editor or Link Properties dialog
CalDav access to some servers not working. Workaround: Set preference network.cookie.same-site.enabled to false.
Chat: Twitter not working due to API changes at Twitter.com (solution forthcoming)