Thunderbird 68.0 is out: major email client update

The Thunderbird team has released Thunderbird 68.0, a new major version of the desktop email client that is going to replace the current branch Thunderbird 60.x in the long run.
Thunderbird 68.0 is a major update that changes quite a few things; that explains why it is not pushed via the email client's automatic updating system at this point in time. Thunderbird users who are interested in the new version may download it from the project website to install it manually. Organisations may point the browser to the Thunderbird for Organisations page instead to download a MSI package or the 64-bit installer for Windows.
Check out our guide on upgrading 32-bit Thunderbird to 64-bit if you still run a 32-bit copy.
The team plans to push Thunderbird 68.1 via the automatic update systems.
Note: it is highly recommended that you back up profile and data folders. If things go wrong, you may remove the new version, install the old again, and restore the backup.
Thunderbird 68.0
The release notes list new features, changes, and fixes. One of the major differences to Thunderbird 60.x is that add-ons may only work if the add-on developers have adapted them. Any add-on that has not been adapted will be disabled when you run Thunderbird 68.0.
While you can check that in a running copy of Thunderbird 68.0, you may also check the official add-ons repository to find out if installed extensions are listed as compatible with the new version of the email client.
I don't run a lot of extensions in Thunderbird but all three installed extensions -- Compact Header, Manually Sort folders, and Subject Manager -- were disabled automatically after the upgrade to Thunderbird 68.0 because they are not compatible with the version of the email client.
Another change in this regard is that Thunderbird 68.0 supports only WebExtension themes or dictionaries.
As far as new features are concerned, there are quite a few:
- You may now install and use different language packs in Thunderbird. You need to set intl.multilingual.enabled to True first in the Options and may then select language packs in the advanced options of the email client.
- A new "mark all folders read" option for all email accounts in the right-click context menu.
- Downgrade protection to block profile access when earlier versions of Thunderbird are launched. You may override this by starting Thunderbird with the --allow-downgrade parameter.
- In chat, individual spellcheckers may be selected for each conversation.
- File link attachments can be linked to again instead of uploading them.
- Filters may run periodically and filter logging has improved.
- Support for Yandex OAuth 2 authentication.
- New Policy Engine using Windows Group Policy or JSON files.
- TCP keepalive for the IMAP protocol.
- Full unicode support for MAPI interfaces.
- Support for MAPISendMailW.
- Time Zone data in Calendar may include past and future changes.
The list of changes and fixes is equally long. Noteworthy changes include that options are displayed in a tab and not window, that there is a new Hamburger menu to launch certain tools and run actions right from it, theme improvements including a dark message list and thread pane option, improved phishing detection for messages with "certain forms", and improvements to scam warnings.
The auto-compacting thresholds has been increased from 20 Megabytes to 200 Megabytes but you can still change the value in the Options under Network & Disk Space.
You can check out the full release notes here.
Closing words
I made the switch earlier today and like the new release even though it disabled all three extensions that I used previously. Thunderbird 68.0 feels a lot snappier and faster, and while that is certainly just my impression after a short period of use, it looks as if some of the performance issues could be a thing of the past.
I'd still suggest to test the new release before making the switch especially if you rely on certain extensions.
Now You: What is your take on the new release?


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!