Mozilla Thunderbird

What is new in this release:

Fixed:

• Double-clicking on a word in the Write window sometimes launched the Advanced Property Editor or Link Properties dialog
• Cookie removal (not working since Thunderbird version 52)
• "Download rest of message" not working if global inbox was used
• Encoding problems for users (especially in Poland) when a file was sent via a folder using "Sent to > Mail recipient" due to a problem in the Thunderbird MAPI interface
• According to RFC 4616 and 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. The SMTP LOGIN and POP3 USER/PASS authentication methods are now using a Latin-1 encoding again to work around this issue.
• Shutdown crash/hang after entering an empty IMAP password

What is new in version 60.0:

• When writing a message, a delete button now allows the removal of a recipient. This delete button is displayed when hovering the To/Cc/Bcc selector.
• Many improvements to attachments handling during compose: Attachments can now be reordered using a dialog, keyboard shortcuts, or drag and drop. The "Attach" button moved to the right to be above the attachment pane. The access key of the attachment pane (e.g. Alt+M, may vary depending on localization, Ctrl+M on Mac) now also works to show or hide the pane. The attachment pane can also be shown initially when composing a new message. Right-click on the header to enable this option. Hiding a non-empty attachment pane will now show a placeholder paperclip to indicate the presence of attachments and avoid sending them accidentally.
• "Edit Template" command. This also solves various problems when saving as template (duplicates created, message ID lost).
• "New Message from Template" command
• Allow changing the Spellcheck Language from status bar
• Light and Dark themes
• WebExtension themes are now enabled in Thunderbird
• A default startup directory in the address book window can now be configured
• Individual feed update interval
• An option under "Tools > Options, Advanced, General" now allows to select whether date/time display will follow the application locale (adjusted by operating system's format settings for that locale) or the locale selected in the operating system's regional settings. In other words, an US English Thunderbird can use, for example, German formats.
• OAuth2 authentication for Yahoo and AOL
• FIDO U2F support
• Thunderbird now allows the conversion of folders from mbox to maildir format and vice versa. This is an experimental feature that needs to be enabled by setting the preference mail.store_conversion_enabled. Note that this functionality does not not work if the option "Allow Windows Search/Spotlight to search messages" is selected.
• Calendar: Allow copying, cutting or deleting of a selected occurrence or the entire series for recurring events
• Calendar: Provide an option to display locations for events in calendar day and week views
• Calendar: Provide the ability for sending/not sending meeting notifications directly instead of showing a popup
• Calendar: Option to select the target calendar when pasting an event or task
• Calendar: Allow email scheduling for CalDAV servers supporting server-side scheduling
• Thunderbird Chat now contains multiple built-in message themes