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. __TOC__ =Filtering sent/archived messages = You can finally 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 [https://www.mozilla.org/projects/calendar/ Lightning] calendar add-on is bundled with Thunderbird.

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.

Filtering sent/archived messages

You can finally 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.