This article describes the major changes that are visible to users in Thunderbird version 38. Full details of all the changes can be found in the Thunderbird 38 [https://www.mozilla.org/en-US/thunderbird/38.0/releasenotes/ release notes]. __TOC__ =Chat supports Yahoo Messenger= Thunderbird chat now supports [https://bugzilla.mozilla.org/show_bug.cgi?id=955574 Yahoo Messenger]. =Filtering sent/archived messages = You can now filter on [https://bugzilla.mozilla.org/show_bug.cgi?id=11039 sent] and [https://bugzilla.mozilla.org/show_bug.cgi?id=479823 archived] messages. =Search multiple address books = You can now [https://bugzilla.mozilla.org/show_bug.cgi?id=170270 search multiple address books]! =Expanded Folder Pane columns= In the folder pane (the list of folders on the left), you can now show expanded options (Unread, Total and Size) {menu View|Layout|Folder Pane Columns}. =Google OAuth2= [https://developers.google.com/gmail/oauth_overview The Gmail IMAP and SMTP servers have been "extended" in a non-standard way to support authorization via the industry-standard OAuth 2.0 protocol]. Thunderbird 38 supports this [https://bugzilla.mozilla.org/show_bug.cgi?id=849540 OAuth] "extension". =Calendar integration= Starting in Thunderbird 38, the [[Integration into Thunderbird|Lightning]] calendar add-on is bundled with Thunderbird. =Mail Composition Fixes= Some idiosyncrasies in the message compose window have been addressed: The composition font is no longer lost after clicking elsewhere in the message and then returning to the end of the line of the text being entered. Also, the composition font is no longer lost after pasting a bitmap from the clipboard. The inline spell checker doesn't lose the red underlines any more. Inline spell checking: New messages will now always be spell-checked in the language selected in {menu Tools|Options|Composition|Spelling|Language} and not as before in the last language used. The spell checking language is now always synchronised between subject and message body, you can even compose messages in different languages concurrently now without having to switch dictionary back and forward. =Font Handling on Linux= Linux provides system fonts "sans-serif", "serif" and "monospace". These font names conflict with the generic CSS font family names. Therefore and for compatibility with Thunderbirds on other platforms, the ability to compose messages using these three fonts was removed on Linux. Users who had selected one of these fonts as their default composition font have to select a different font. Instead of "sans-serif", "serif" or "monospace" users should select "Helvetica, Arial", "Times" or "Courier" (or "Fixed Width") respectively. The three aforementioned Linux system fonts can still be used as default display fonts.

This article describes the major changes that are visible to users in Thunderbird version 38. Full details of all the changes can be found in the Thunderbird 38 release notes.

Chat supports Yahoo Messenger

Thunderbird chat now supports Yahoo Messenger.

Filtering sent/archived messages

You can now filter on sent and archived messages.

Search multiple address books

You can now search multiple address books!

Expanded Folder Pane columns

In the folder pane (the list of folders on the left), you can now show expanded options (Unread, Total and Size) View|Layout|Folder Pane Columns.

Google OAuth2

The Gmail IMAP and SMTP servers have been "extended" in a non-standard way to support authorization via the industry-standard OAuth 2.0 protocol. Thunderbird 38 supports this OAuth "extension".

Calendar integration

Starting in Thunderbird 38, the Lightning calendar add-on is bundled with Thunderbird.

Mail Composition Fixes

Some idiosyncrasies in the message compose window have been addressed: The composition font is no longer lost after clicking elsewhere in the message and then returning to the end of the line of the text being entered. Also, the composition font is no longer lost after pasting a bitmap from the clipboard. The inline spell checker doesn't lose the red underlines any more.

Inline spell checking: New messages will now always be spell-checked in the language selected in Tools|Options|Composition|Spelling|Language and not as before in the last language used. The spell checking language is now always synchronised between subject and message body, you can even compose messages in different languages concurrently now without having to switch dictionary back and forward.

Font Handling on Linux

Linux provides system fonts "sans-serif", "serif" and "monospace". These font names conflict with the generic CSS font family names. Therefore and for compatibility with Thunderbirds on other platforms, the ability to compose messages using these three fonts was removed on Linux. Users who had selected one of these fonts as their default composition font have to select a different font. Instead of "sans-serif", "serif" or "monospace" users should select "Helvetica, Arial", "Times" or "Courier" (or "Fixed Width") respectively.

The three aforementioned Linux system fonts can still be used as default display fonts.