Thunderbird 38.0.1 is now available for download.Thunderbird 38.0.1 contains underlying code that is based off of Firefox 38.0.1esr. There was no Thunderbird 38.0 release. What’s new in this release?
GMail supports OAuth2 authentication, removing the need to manually select “allow less secure applications” in Google options for the account.
Ship Lightning calendar addon with Thunderbird and enable with an opt-out dialog.
Filter sent messages
Filter messages when archived
Enable search in multiple/all address books
Add support for Yahoo Messenger in Chat
Support Internationalized domain name URLs for RSS feeds
Show expanded columns in folder pane
Allow file-per-message (maildir) local message storage
Add a Learn more link to the support page in feeds subscribe dialog
Add reading position marker line to conversations
The editor for twitter should show inputtable character count
Thunderbird will no longer use SHA-1 to sign messages
Removed rarely used character sets: T.61-8bit, non-encoding Mac encoders, VISCII, x-viet-tcvn5712, x-viet-vps x-johab, ARMSCII8 , map us-ascii to windows-1252, ISO-8859-6-I and -E and ISO-8859-8-E
Disable CONDSTORE support for IMAP to prevent discrepancies in IMAP message status (deleted, unread) on
some servers
Make OpenSearch queries open in the user’s default browser
Default to using SSL for XMPP and IRC. This might cause issues for self-signed certificates
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