Thunderbird 45.0 has been released

Martin Brinkmann
Apr 13, 2016
Updated • Feb 9, 2017
Email, Thunderbird

Mozilla has released an update to the desktop email client Thunderbird that brings the version of the program to Thunderbird 45.0.

It is a major update of the application which has been on life support ever since Mozilla decided to hand over development to the community in 2012 and use freed up resources for other projects.

Then in 2015 Mozilla announced that it would drop the email client altogether even though usage was still on the rise.

Thunderbird 45.0

The update is already available on the official download site but the client itself has yet to pick it up. This will happen soon however, and you can run checks for updates with a click on Help > About Thunderbird from within the application.

So what is new in Thunderbird 45.0?

The short answer: a lot. If you check out the release notes, you find more items listed there as new as in the past two years combined.

Customize From Address

customize from

The new feature is available when you click on the from field when composing email addresses. It enables you to make changes to the from address that are valid only for the current email.

One example where this may be useful is if an email service supports aliases. If you use Gmail for instance, you can add +text after the username of the email address to create an alias.

Correspondents column


Correspondents is a new column that is displayed by default that combines sender and recipients. You can still add the from column back by right-clicking on the header and selecting the option from the menu that opens up.

The main difference between the two is the arrow that you see on the right of the sender or recipient. A left arrow indicates that your selected email account received the message, a right arrow that it was sent from it.

Better Remote Content Exceptions

remote content

When you have selected to block remote content in Thunderbird by default, you get a message in emails that want to load remote content that reads "to protect your privacy, Thunderbird has blocked remote content in this message".

The new control options provide you with granular options to allow remote content.

Other additions

  • Better support for XMPP chatrooms and commands (Thunderbird ships with a chat component that you can make use of).
  • The Spell checker and dictionary work in the subject line of emails now.
  • Dropdown in compose window to set specific font sizes.
  • Name and email address can be copied from message headers of emails now.
  • Support for OAuth authentication for added.
  • Option added to always use HTML formatting to prevent unexpected format loss.
  • OpenStreetMap and other map services can be used for maps (it is unclear how and where though, and the release notes don't reveal any information besides that it is now an option).


Besides new features and improvements to existing features, the team has fixed the following issues in Thunderbird 45.0.

  • External images were not displayed in reply/forward.
  • When saving drafts that were edited as a new message, the original draft was overwritten.
  • Fixed a crash when parsing IMAP messages.
  • Fixed spell checker checking spelling in invisible HTML parts.
  • Fixed extra spaces issue when sending messages with Chinese, Japanese, or Korean characters.
  • Pre-formatted blocks are properly preserved in message replies.
  • Fixed a issue where copy and paste from plain text documents lost whitespace.
  • Fixed "open draft", "forward", "edit as new" and "reply" creating messages with incorrect character encoding.
  • Fixed sort direction change using Grouped by view.
  • Fixed an issue where new emails were not displayed in the selected sort order.
  • Fixed an issue with attachments failing to upload.
  • Fixed an issue where drag and drop of attachments failed to the operating system folder.
  • Fixed XMPP connection problems.

As you can see, lots of changes and fixes in the new version of Thunderbird.

Thunderbird 45.1.0

The email client Thunderbird 45.1.0 was released on May 10, 2016. It is a bug fix release that takes care of the following issues:

  • Drag and drop of contact names to address box of a message failed.
  • UI element inconsistency when moused over on retina displays.
  • DIGEST-MD5 authentication in JS-XMPP failed for some (disabled).
  • Font Indicator claimed for some fonts that they were not installed.
  • Printing failed in composition window.
  • Paragraph mode improvements when composing messages.
  • Automatic correspondents column upgrade disabled.

Thunderbird 45.1.1

Thunderbird 45.1.1 was released on May 31, 2016. It is a bug fix release the fixes the following issues:

  • The enter-key closed the mailing list panel when adding members to it instead of jumping to the next line.
  • Emails without HTML elements was sent as HTML email if the format auto-detect option was enabled.
  • Options applied to templates were lost when the template was used.
  • The option to delete contacts was not working when contacts were found using search.
  • Views from global searches did not respect the mail.threadpane.use_correspondents setting.

Thunderbird 45.2.0

Thunderbird 45.2.0 was released on June 30, 2016. The update patches several security issues and the following issues:

  • Invitations to events could not be printed.
  • A reporting issue that false stated that there was not enough disk space during compacting.
  • The dragging and dropping of multiple contacts from the contacts list onto an addressbook while All Addressbooks were selected moved only one contact.
  • Links were not always detected in the message body.

Thunderbird 45.3.0

Thunderbird 45.3.0 was released on August 30, 2016. It is a bug fix and security release.

  • Disposition-Notification-To could not be used in mail.compose.other.header
  • FIXED"edit as new message" on a received message pre-filled the sender as the composing identity.
  • FIXEDCertain messages caused corruption of the drafts summary database.

Thunderbird 45.4.0

Thunderbird45.4.0 was released on October 3, 2016. It is a bug fix release that makes the following changes to the email client:

  • Display name was truncated if no separating space before email address.
  • FIXEDRecipient addresses were shown in red despite being inserted from the address book in some circumstances.
  • FIXEDAdditional spaces were inserted when drafts were edited.
  • FIXEDMail saved as template copied In-Reply-To and References from original email.
  • FIXEDThreading broken when editing message draft, due to loss of Message-ID
  • FIXED"Apply columns to..." did not honor special folders

Thunderbird 45.5.0

Thunderbird 45.5.0 was released on November 18, 2016. It is a bug fix release:

  • IMPORTANT: Changed recipient address entry: Arrow-keys now copy the pop-up value to the input field. Mouse-hovered pop-up value can no longer be confirmed with tab or enter key. This restores the behavior of Thunderbird 24.
  • CHANGEDSupport changes to character limit in Twitter
  • FIXEDReply with selected text containing quote resulted in wrong quoting level indication
  • FIXEDEmail invitation might not be displayed when description contains non-ASCII characters
  • FIXEDAttempting to sort messages on the Date field whilst a quick filter is applied got stuck on sort descending
  • FIXEDMail address display at header pane displayed incorrectly if the address contains UTF-8 according to RFC 6532

Thunderbird 45.6.0

Thunderbird 45.6.0 was released on December 28, 2016. It fixes several security issues and an issue that caused the system integration dialog to show up on every start of Thunderbird.

Thunderbird 45.7.0

Thunderbird 45.7.0 was released on January 26, 2017. It is a release that fixes several issues in the email client including security issues.

  • Message preview pane non-functional after IMAP folder was renamed or moved
  • FIXED"Move To" button on "Search Messages" panel not working
  • FIXEDMessage sent to "undisclosed recipients" shows no recipient (non-functional since Thunderbird version 38)
  • FIXEDCalendar: No way to accept/decline email invitations when sent and received messages are stored in the same folder

Thunderbird 45.7.1

Thunderbird 45.7.1 was released on February 7, 2017. It is a bug fix release that fixes a crash issue when viewing certain IMAP messages.

One issue, that the message preview pane is not functional after moving or renaming IMAP folders does still exist.

Thunderbird 45.0 has been released
Article Name
Thunderbird 45.0 has been released
Mozilla has released an update to the desktop email client Thunderbird that brings the version of the program to Thunderbird 45.0.
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  1. JMGG said on January 19, 2012 at 8:25 am

    You said that Outlook isn’t your main email client, so which is your main one?

    1. BalaC said on January 19, 2012 at 9:42 am

      I think its thunderbird

    2. Martin Brinkmann said on January 19, 2012 at 10:15 am

      It is Mozilla Thunderbird.

  2. Salaam said on September 24, 2012 at 9:52 pm

    Awesome! This actually solved my problem… what a stupid bug.

  3. Claud said on December 19, 2012 at 2:08 am

    If this is the same bug that I’ve encountered, there may be another fix: (1) hover over open Outlook item in Taskbar, cursor up to hover over Outlook window item, and right-click; (2) this should give you Restore / Move / Size / Minimize / Maximize — choose Move or Size; (3) use your cursor keys, going arbitrarily N/S/E/W, to try to move or size the Outlook window back into view. Basically, the app behaves as though it were open in a 0x0 window, or at a location that’s offscreen, and this will frequently work to resize and/or move the window. Don’t forget to close while resized/moved, so that Outlook remembers the size/position for next time.

    1. Lynda said on February 12, 2013 at 3:37 pm

      THANK YOU Claude!!! I could get the main window to launch but could not get any other message window to show on the desktop. You are my hero!!!!

    2. Chad said on November 20, 2018 at 4:24 pm

      Solved my issue! 6 years later and this is still problem…

    3. Ivan X said on January 21, 2021 at 4:50 pm

      Fantastic. Thank you. Size did the trick.

  4. Andrew said on October 26, 2013 at 7:06 am

    This solved my Outlook problem, too. Thank you. :)

  5. Charles said on December 7, 2013 at 7:23 pm

    Thank you so much, this started happening to me today and was causing big problems. You are a life saver, I hope I can help you in some way some day.

  6. garth said on November 7, 2014 at 7:13 pm

    You are a god – thank you!

  7. Faisal said on February 9, 2015 at 10:09 am

    thanks a lot…. work like charm.. :-)

  8. Simon said on March 24, 2015 at 11:36 pm

    Yah…thanks Claude. I’ve been having the same problem and tried all the suggestions…your solution was the answer. It had resized itself to a 0/0 box. Cheers

  9. Olu said on April 14, 2015 at 1:35 pm

    Excellent post. This had me baffled even trying to accurately describe the problem. This fixed it for me.
    Thank you

  10. Coenig said on July 23, 2015 at 7:36 am

    Thanks a lot for the article. Don’t know why it happenend, don’t know how it got fixed, but it was really annoying and now it works :-)

  11. Fali said on January 20, 2016 at 4:19 pm

    Thanks a lot. I was facing this issue from past 3 week. I tried everything but no resolution. The issue was happening intermittently and mainly when I was changing the display of screen ( as i use 2 monitors). The only option i had was to do system restore. But thanks to you.

    1. MIki said on January 10, 2019 at 11:54 am

      I’ve been tried to sole this problem for 12hours. Your comment about changing the display of screen helped me a lot!! Thanks!!

  12. Christina said on January 20, 2016 at 6:14 pm

    Thank you…don’t know why this happened but your instructions helped me fix it. Running Windows 10 and office pro 2007

  13. Oz said on July 22, 2016 at 3:20 pm

    Great tip! Thanks!

  14. Tracy said on September 1, 2016 at 4:48 pm

    Worked for me, too – thank you!!!

  15. shawn said on September 9, 2016 at 10:25 am

    It’s Worked for me, too
    thank you very much!

  16. Jari said on October 31, 2016 at 11:53 am

    I had a similar issue with Outlook 2013 on Windows 10 and this helped me to fix it. Thank you very much!

  17. Michel H said on November 30, 2016 at 11:08 pm

    Thank you so much. Solved!
    Considering you published this in 2012, incredible not been debugged by Microsoft.
    Thank you again. M

  18. Ziad Bitar said on January 9, 2017 at 2:00 am

    This problem was faced by only one user logging to TS 2008 r2 using outlook 2010.The issue was resolved.


  19. Anonymous said on February 15, 2017 at 5:24 pm

    Great tip. Thank you!!!! If it helps, I had to use the Control Key and the arrow keys at the same time to bring my window back into view. Worked like a charm.

  20. Rochelle said on March 6, 2017 at 11:59 am

    Thank you, this worked !!!!

  21. anom1234 said on May 20, 2018 at 11:20 pm

    Man, you are a fucking god. Thanks a lot, what an annoying bug!!

  22. JC said on October 12, 2020 at 2:14 pm

    Awesome, this post solved the issue. Many thanks!

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