Thunderbird 78.8.0 security update is out

Thunderbird 78.8.0 has been released on February 23, 2021. The release schedule of the email client follows that of the Firefox web browser as code is shared between the two browsers. It is often the case that both products are affected by the same security vulnerabilities, and that security patches are released for both around the same time.
The new version of Thunderbird 78.8.0 is available already. Users should see it being installed automatically in client versions provided that automatic updates are enabled. To verify the installed version of the email client, select Help > About Thunderbird (if the menu bar is not displayed, press Alt on the keyboard to show it). The menu displays the version and runs a check for updates. The latest version of Thunderbird can also be downloaded directly from the project website. The downloaded file can then be installed manually to upgrade existing installations, or to install Thunderbird anew or for the first time.
The security advisory page lists four distinct security vulnerabilities that have been patched in Thunderbird 78.8. Three of the four received a severity rating of high, one a rating of low. High is the second highest rating after critical.
Thunderbird 78.8.0 includes several bug fixes but no new features next to that. The release notes highlight the following changes:
- fixed an issue that created an error when importing an address book from a CSV file.
- fixed security information not being displayed correctly before a s/MIME message was saved as a draft.
- fixed FileLINK user interface in CalDAV calendars.
- fixed that recurring tasks were always displayed as incomplete and that filters could not be used.
- fixes to "various UI widgets" that did not work correctly.
- dark theme improvements
- the extension manager did not have a link to the support web page for add-ons.
The Thunderbird team outlined its plans for the email client recently. Many major updates will be introduced in Thunderbird 91, which will be released later this year.
Now You: what would you like to see in future releases?


You said that Outlook isn’t your main email client, so which is your main one?
I think its thunderbird
It is Mozilla Thunderbird.
Awesome! This actually solved my problem… what a stupid bug.
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.
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!!!!
Solved my issue! 6 years later and this is still problem…
Fantastic. Thank you. Size did the trick.
This solved my Outlook problem, too. Thank you. :)
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.
You are a god – thank you!
thanks a lot…. work like charm.. :-)
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
Excellent post. This had me baffled even trying to accurately describe the problem. This fixed it for me.
Thank you
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 :-)
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.
I’ve been tried to sole this problem for 12hours. Your comment about changing the display of screen helped me a lot!! Thanks!!
Thank you…don’t know why this happened but your instructions helped me fix it. Running Windows 10 and office pro 2007
Great tip! Thanks!
Worked for me, too – thank you!!!
It’s Worked for me, too
thank you very much!
I had a similar issue with Outlook 2013 on Windows 10 and this helped me to fix it. Thank you very much!
Thank you so much. Solved!
Considering you published this in 2012, incredible not been debugged by Microsoft.
Thank you again. M
This problem was faced by only one user logging to TS 2008 r2 using outlook 2010.The issue was resolved.
Thanks.
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.
Thank you, this worked !!!!
Man, you are a fucking god. Thanks a lot, what an annoying bug!!
Awesome, this post solved the issue. Many thanks!