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Join UsVersion 52.0beta, first offered to channel users on February 28, 2017
Optionally remove corresponding data files when removing an account from Thunderbird
Possibility to copy message filter
Calendar: Event can now be created and edited in a tab
Calendar: Processing of received invitation counter proposals
Chat: Support Twitter Direct Messages
Chat: Liking and favoriting in Twitter
IMPORTANT: The way images are included in a compose window has changed. Images are now included as data URIs and not as references to parts of other messages or operating system files. This allows better interoperability with office packages such as MS Office or LibreOffice. Images linked from locations on the internet will no longer be downloaded and attached to the message automatically. This can be changed for each image individually via the Image Properties dialog or globally by setting the preference mail.compose.attach_http_images.
On Linux PulseAudio is now required to play sound
Messages in IMAP folders read on external device are now filtered by default
Chat: Removed Yahoo! Messenger support (since Yahoo removed support)
Crash when viewing certain IMAP messages and various crashes on Mac
Message preview pane non-functional after IMAP folder was renamed or moved
Editing in paragraph format: Pressing Shift+Enter sometimes doesn't move the cursor to the next line
Paste as quotation doesn't always work
Long lines in plain text replies not properly wrapped
Undesired white-space before signature in paragraph mode
IMAP message part caching
Links with escaped non-ASCII (international) characters can't be clicked
Calendar: Events specified in timezone "local time" generate alerts in UTC time