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  <id>https://www.thunderbird.net/thunderbird/releases/atom.xml</id>
  <title>Thunderbird Release Notes</title>
  <subtitle type="text">Thunderbird Release Notes feed provides a simple way to keep up to date with Thunderbird releases.</subtitle>

  <updated>2026-06-13T15:11:17+00:00</updated>
  <logo>https://www.thunderbird.net/media/img/thunderbird/thunderbird-256.png</logo>
  <icon>https://www.thunderbird.net/media/img/thunderbird/favicon-196.png</icon>

  <link rel="alternate" type="text/html" href="https://www.thunderbird.net//en-US/thunderbird/releases"/>
  <link rel="self" type="application/atom+xml" href="https://www.thunderbird.net/thunderbird/releases/atom.xml"/>

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  <entry>
    <id>https://www.thunderbird.net/en-US/thunderbird/140.12.0esr/releasenotes/</id>
    <title type="html">Thunderbird 140.12.0esr</title>
    <author>
      <name>Thunderbird</name>
      <uri>https://www.thunderbird.net</uri>
    </author>
    <link rel="alternate" type="text/html" href="https://www.thunderbird.net/en-US/thunderbird/140.12.0esr/releasenotes/"/>
    <updated>2026-06-16T00:00:00+00:00</updated>
    <published>2026-06-16T00:00:00+00:00</published>

    <content type="html"><![CDATA[
      

  
  

  
    

    
      
        
        

        
          <h3>Changed</h3>
        

        
        
          <ul>
        

        
        

        <li>
          <p>There are no Thunderbird changes requiring release notes in this release</p>
          
        </li>
      
    
    </ul>
  
  

<p>As always, you’re encouraged to <a href="https://connect.mozilla.org/t5/ideas/idb-p/ideas/label-name/thunderbird">tell us what you think</a>, <a href="https://support.mozilla.org/questions/new/thunderbird">ask for help</a>, or <a href="https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird">file a bug in Bugzilla</a></p>
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  </entry>
  
  <entry>
    <id>https://www.thunderbird.net/en-US/thunderbird/140.11.1esr/releasenotes/</id>
    <title type="html">Thunderbird 140.11.1esr</title>
    <author>
      <name>Thunderbird</name>
      <uri>https://www.thunderbird.net</uri>
    </author>
    <link rel="alternate" type="text/html" href="https://www.thunderbird.net/en-US/thunderbird/140.11.1esr/releasenotes/"/>
    <updated>2026-05-26T00:00:00+00:00</updated>
    <published>2026-05-26T00:00:00+00:00</published>

    <content type="html"><![CDATA[
      

  
  

  
    

    
      
        
        

        
          <h3>Changed</h3>
        

        
        
          <ul>
        

        
        

        <li>
          <p>There are no Thunderbird changes requiring release notes in this release</p>
          
        </li>
      
    
    </ul>
  
  

<p>As always, you’re encouraged to <a href="https://connect.mozilla.org/t5/ideas/idb-p/ideas/label-name/thunderbird">tell us what you think</a>, <a href="https://support.mozilla.org/questions/new/thunderbird">ask for help</a>, or <a href="https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird">file a bug in Bugzilla</a></p>
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    </content>
  </entry>
  
  <entry>
    <id>https://www.thunderbird.net/en-US/thunderbird/151.0.1/releasenotes/</id>
    <title type="html">Thunderbird 151.0.1</title>
    <author>
      <name>Thunderbird</name>
      <uri>https://www.thunderbird.net</uri>
    </author>
    <link rel="alternate" type="text/html" href="https://www.thunderbird.net/en-US/thunderbird/151.0.1/releasenotes/"/>
    <updated>2026-05-26T00:00:00+00:00</updated>
    <published>2026-05-26T00:00:00+00:00</published>

    <content type="html"><![CDATA[
      

  
  

  
    

    
      
        
        

        
          <h3>Fixed</h3>
        

        
        
          <ul>
        

        
        

        <li>
          <p>Forwarding/Redirecting Exchange messages failed with NS_ERROR_OUT_OF_MEMORY</p>
          
        </li>
      
    
    </ul>
  
  

<p>As always, you’re encouraged to <a href="https://connect.mozilla.org/t5/ideas/idb-p/ideas/label-name/thunderbird">tell us what you think</a>, <a href="https://support.mozilla.org/questions/new/thunderbird">ask for help</a>, or <a href="https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird">file a bug in Bugzilla</a></p>
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    </content>
  </entry>
  
  <entry>
    <id>https://www.thunderbird.net/en-US/thunderbird/140.11.0esr/releasenotes/</id>
    <title type="html">Thunderbird 140.11.0esr</title>
    <author>
      <name>Thunderbird</name>
      <uri>https://www.thunderbird.net</uri>
    </author>
    <link rel="alternate" type="text/html" href="https://www.thunderbird.net/en-US/thunderbird/140.11.0esr/releasenotes/"/>
    <updated>2026-05-19T00:00:00+00:00</updated>
    <published>2026-05-19T00:00:00+00:00</published>

    <content type="html"><![CDATA[
      

  
  

  
    

    
      
        
        

        
          <h3>Fixed</h3>
        

        
        
          <ul>
        

        
        

        <li>
          <p><a href="https://www.mozilla.org/en-US/security/known-vulnerabilities/thunderbird/#thunderbird140.11">Security fixes</a></p>
          
        </li>
      
    
    </ul>
  
  

<p>As always, you’re encouraged to <a href="https://connect.mozilla.org/t5/ideas/idb-p/ideas/label-name/thunderbird">tell us what you think</a>, <a href="https://support.mozilla.org/questions/new/thunderbird">ask for help</a>, or <a href="https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird">file a bug in Bugzilla</a></p>
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    </content>
  </entry>
  
  <entry>
    <id>https://www.thunderbird.net/en-US/thunderbird/151.0/releasenotes/</id>
    <title type="html">Thunderbird 151.0</title>
    <author>
      <name>Thunderbird</name>
      <uri>https://www.thunderbird.net</uri>
    </author>
    <link rel="alternate" type="text/html" href="https://www.thunderbird.net/en-US/thunderbird/151.0/releasenotes/"/>
    <updated>2026-05-19T00:00:00+00:00</updated>
    <published>2026-05-19T00:00:00+00:00</published>

    <content type="html"><![CDATA[
      

  
  

  
    

    
      
        
        

        
          <h3>What’s New</h3>
        

        
        
          <ul>
        

        
        

        <li>
          <p>Enable Thundermail OAuth sign-in with account auto-configuration</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Enable users to override OAuth provider details for EWS accounts</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Tasks can be sorted by created or modified date</p>
          
        </li>
      
    
      
        
        
          </ul>
        

        
          <h3>Changed</h3>
        

        
        
          <ul>
        

        
        

        <li>
          <p>Reinstated default application check when Thunderbird starts</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>OpenPGP public key no longer attached by default in signed-only messages</p>
          
        </li>
      
    
      
        
        
          </ul>
        

        
          <h3>Fixed</h3>
        

        
        
          <ul>
        

        
        

        <li>
          <p>Thunderbird could crash when processing message headers</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Thunderbird could crash on startup</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Calendar view tabs were not properly keyboard accessible</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Thunderbird could crash when processing new incoming messages</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>On macOS, dragging attachments out of Thunderbird created multiple copies</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Cancelling a newsgroup posting was not possible</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Some IMAP emails showed current time instead of correct received date</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Search result count was missing when using 'Find in Message' or Ctrl+F</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Search results showed older irrelevant emails before newer exact matches</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Reply with selected text lost formatting for HTML messages containing &lt;/pre&gt;</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Multipart/related attachments were not preserved when editing or forwarding</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Forwarded malformed MIME email had empty body and extra attachment</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>OWL add-on description was not visible in Account Hub for non-en-US locales</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Account Hub prompted for password after OAuth login, causing Outlook setup failure</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Auto-discovered Account Hub values were not preserved for manual editing</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Account Hub links for encryption and signature opened the wrong account</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Virtual folders did not update correctly for filtered POP3 messages</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Thunderbird could crash in spam filtering</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Using thunderbird -compose with double quotes made last email address invalid</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>With auto-mark-read disabled, large mail still marked as read during load delay</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>It was not possible to create date-only all-day tasks</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Task context menu (right-click) had several disabled menu items</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>'Current Tasks' view showed past and finished tasks instead of only unfinished</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p>Visual and UX improvements</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p><a href="https://www.mozilla.org/en-US/security/known-vulnerabilities/thunderbird/#thunderbird151">Security fixes</a></p>
          
        </li>
      
    
      
    
    </ul>
  
  
    <h3>
      Known Issues
    </h3>
    <ul>
      
        <li>
          <p>Forwarding/Redirecting Exchange message fails (see <a href="https://bugzilla.mozilla.org/show_bug.cgi?id=2036765">bug</a> for work-around)</p>
          
          
        </li>
      
    </ul>
  

<p>As always, you’re encouraged to <a href="https://connect.mozilla.org/t5/ideas/idb-p/ideas/label-name/thunderbird">tell us what you think</a>, <a href="https://support.mozilla.org/questions/new/thunderbird">ask for help</a>, or <a href="https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird">file a bug in Bugzilla</a></p>
<style> li p { display: inline; } </style>
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  </entry>
  
  <entry>
    <id>https://www.thunderbird.net/en-US/thunderbird/140.10.2esr/releasenotes/</id>
    <title type="html">Thunderbird 140.10.2esr</title>
    <author>
      <name>Thunderbird</name>
      <uri>https://www.thunderbird.net</uri>
    </author>
    <link rel="alternate" type="text/html" href="https://www.thunderbird.net/en-US/thunderbird/140.10.2esr/releasenotes/"/>
    <updated>2026-05-08T00:00:00+00:00</updated>
    <published>2026-05-08T00:00:00+00:00</published>

    <content type="html"><![CDATA[
      

  
  

  
    

    
      
        
        

        
          <h3>Fixed</h3>
        

        
        
          <ul>
        

        
        

        <li>
          <p><a href="https://www.mozilla.org/en-US/security/known-vulnerabilities/thunderbird/#thunderbird140.10.2">Security fixes</a></p>
          
        </li>
      
    
    </ul>
  
  

<p>As always, you’re encouraged to <a href="https://connect.mozilla.org/t5/ideas/idb-p/ideas/label-name/thunderbird">tell us what you think</a>, <a href="https://support.mozilla.org/questions/new/thunderbird">ask for help</a>, or <a href="https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird">file a bug in Bugzilla</a></p>
<style> li p { display: inline; } </style>
      ]]>
    </content>
  </entry>
  
  <entry>
    <id>https://www.thunderbird.net/en-US/thunderbird/150.0.2/releasenotes/</id>
    <title type="html">Thunderbird 150.0.2</title>
    <author>
      <name>Thunderbird</name>
      <uri>https://www.thunderbird.net</uri>
    </author>
    <link rel="alternate" type="text/html" href="https://www.thunderbird.net/en-US/thunderbird/150.0.2/releasenotes/"/>
    <updated>2026-05-08T00:00:00+00:00</updated>
    <published>2026-05-08T00:00:00+00:00</published>

    <content type="html"><![CDATA[
      

  
  

  
    

    
      
        
        

        
          <h3>Fixed</h3>
        

        
        
          <ul>
        

        
        

        <li>
          <p><a href="https://www.mozilla.org/en-US/security/known-vulnerabilities/thunderbird/#thunderbird150.0.2">Security fixes</a></p>
          
        </li>
      
    
    </ul>
  
  

<p>As always, you’re encouraged to <a href="https://connect.mozilla.org/t5/ideas/idb-p/ideas/label-name/thunderbird">tell us what you think</a>, <a href="https://support.mozilla.org/questions/new/thunderbird">ask for help</a>, or <a href="https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird">file a bug in Bugzilla</a></p>
<style> li p { display: inline; } </style>
      ]]>
    </content>
  </entry>
  
  <entry>
    <id>https://www.thunderbird.net/en-US/thunderbird/140.10.1esr/releasenotes/</id>
    <title type="html">Thunderbird 140.10.1esr</title>
    <author>
      <name>Thunderbird</name>
      <uri>https://www.thunderbird.net</uri>
    </author>
    <link rel="alternate" type="text/html" href="https://www.thunderbird.net/en-US/thunderbird/140.10.1esr/releasenotes/"/>
    <updated>2026-04-30T00:00:00+00:00</updated>
    <published>2026-04-30T00:00:00+00:00</published>

    <content type="html"><![CDATA[
      

  
  

  
    

    
      
        
        

        
          <h3>Fixed</h3>
        

        
        
          <ul>
        

        
        

        <li>
          <p><a href="https://www.mozilla.org/en-US/security/known-vulnerabilities/thunderbird/#thunderbird140.10.1">Security fixes</a></p>
          
        </li>
      
    
    </ul>
  
  

<p>As always, you’re encouraged to <a href="https://connect.mozilla.org/t5/ideas/idb-p/ideas/label-name/thunderbird">tell us what you think</a>, <a href="https://support.mozilla.org/questions/new/thunderbird">ask for help</a>, or <a href="https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird">file a bug in Bugzilla</a></p>
<style> li p { display: inline; } </style>
      ]]>
    </content>
  </entry>
  
  <entry>
    <id>https://www.thunderbird.net/en-US/thunderbird/150.0.1/releasenotes/</id>
    <title type="html">Thunderbird 150.0.1</title>
    <author>
      <name>Thunderbird</name>
      <uri>https://www.thunderbird.net</uri>
    </author>
    <link rel="alternate" type="text/html" href="https://www.thunderbird.net/en-US/thunderbird/150.0.1/releasenotes/"/>
    <updated>2026-04-30T00:00:00+00:00</updated>
    <published>2026-04-30T00:00:00+00:00</published>

    <content type="html"><![CDATA[
      

  
  

  
    

    
      
        
        

        
          <h3>Fixed</h3>
        

        
        
          <ul>
        

        
        

        <li>
          <p>Thunderbird could crash when processing message headers</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p><a href="https://www.mozilla.org/en-US/security/known-vulnerabilities/thunderbird/#thunderbird150.0.1">Security fixes</a></p>
          
        </li>
      
    
    </ul>
  
  

<p>As always, you’re encouraged to <a href="https://connect.mozilla.org/t5/ideas/idb-p/ideas/label-name/thunderbird">tell us what you think</a>, <a href="https://support.mozilla.org/questions/new/thunderbird">ask for help</a>, or <a href="https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird">file a bug in Bugzilla</a></p>
<style> li p { display: inline; } </style>
      ]]>
    </content>
  </entry>
  
  <entry>
    <id>https://www.thunderbird.net/en-US/thunderbird/140.10.0esr/releasenotes/</id>
    <title type="html">Thunderbird 140.10.0esr</title>
    <author>
      <name>Thunderbird</name>
      <uri>https://www.thunderbird.net</uri>
    </author>
    <link rel="alternate" type="text/html" href="https://www.thunderbird.net/en-US/thunderbird/140.10.0esr/releasenotes/"/>
    <updated>2026-04-21T00:00:00+00:00</updated>
    <published>2026-04-21T00:00:00+00:00</published>

    <content type="html"><![CDATA[
      

  
  

  
    

    
      
        
        

        
          <h3>Fixed</h3>
        

        
        
          <ul>
        

        
        

        <li>
          <p>Newly translated strings were not available in Thunderbird</p>
          
        </li>
      
    
      
        
        

        

        
        

        
        

        <li>
          <p><a href="https://www.mozilla.org/en-US/security/known-vulnerabilities/thunderbird/#thunderbird140.10">Security fixes</a></p>
          
        </li>
      
    
    </ul>
  
  

<p>As always, you’re encouraged to <a href="https://connect.mozilla.org/t5/ideas/idb-p/ideas/label-name/thunderbird">tell us what you think</a>, <a href="https://support.mozilla.org/questions/new/thunderbird">ask for help</a>, or <a href="https://bugzilla.mozilla.org/enter_bug.cgi?product=Thunderbird">file a bug in Bugzilla</a></p>
<style> li p { display: inline; } </style>
      ]]>
    </content>
  </entry>
  
</feed>