The first thing I would try is closing and restarting TB. If that didn't help, I'd restart Windows (not shut down and then restart, just restart). Then I'd open TB again, and try those operations again.

It has occasionally happened in the past that a user has discovered a flaw in a new version, but that is rare, and there have not been other reports of the behavior you're describing.

Would you try starting TB without add-ons, (Help > Troubleshoot mode) to see whether the flaw might be an add-on?

Hello, Thank you for the reply. I have already restarted Thunderbird and Windows but the issue was not solved. I have another account under TB that is working properly. It is only the Exchange account that does not work: either the mail is not sent, or when sent, the content is empty. The issue appeared just after upgrading TB.

So this led me to consider that the problem is coming from the synchronization between TB and Exchange through Exquilla.

Do you recommend another software to sync with Microsoft Exchange?

Best regards,

Fadi

I have this problem too. Thunderbird updated and my microsoft account through exquilla disappeared. Then after restarting, it appeared, but I couldn't send emails. After waiting 24 hours (as I read in another post), I restarted TB again and my microsoft/exquilla account disappeared again. Everything was fine until this recent TB update. 102.13.0

Hello, This is exactly the behavior with my account. Is there a way to downgrade TB and go back to the previous version that was working perfectly until the bug is fixed? Best regards, Fadi

Having the same problem. None of the suggested solutions will work.

Definitely. I tried everything. The only way is to go back to the previous version. Is this feasible? can we downgrade back TB?

or is the problem the Exquilla upgrade?

I wish I never hit that button to restart with new updates. The whole day I've been busy trying to get this fixed!! Lost a whole day of work cuz of this! I've uninstalled my email account twice! ExQuilla many times! Nothing! Changed all setting of passwords etc etc. I get emails now after reinstallment but can not send, strangely after new install I would send 2 email.com and then "Failed to send message" And now it started to say "Login to server smtp.office365.com with username xxxx@yyyyy.com failed"

Sending of the message failed. Unable to authenticate to Outgoing server (SMTP) smtp.office365.com. Please check the password and verify the 'Authentication method' in 'Account Settings | Outgoing server (SMTP)'.

Exquilla says on their site it's compatible with this new release. It's like Exchange doesn't accept the connection anymore... but how to fix this?

What's going on!!?? Hope some one here has the fix

Did a Google search for Exquilla Thunderbird. There are a LOT of complaints about Exquilla not working properly after the latest update.

"The only way is to go back to the previous version. Is this feasible? can we downgrade back TB?"

Yes, that is possible, though I don't know an easy, simple way.

First, you need to download the previous edition's installer (.exe) file. Then UNINSTALL Thunderbird (this leaves your data -- messages and settings -- alone). Then install 102.12.0, accepting the default installation.

You can get the installation file by going to https://archive.mozilla.org/pub/thunderbird/releases/102.12.0/

There, click on win64/ and then click on en-US/ and then click on Thunderbird Setup 102.12.0.exe and the file will download to your computer.

Double-click the downloaded file to install the previous version of Thunderbird -- the one that you all agree was working just fine. Accept the default installation, unless you did a custom installation before.

Because it's a new installation, you'll have to fight your way past the Donate requests. I'm sure you've all donated already, haven't you?

All your mail and settings should be there, but you need to go into Settings immediately and in the General category, scroll way down to Updates, and click the setting "Check for updates, but let me choose whether to install them." Otherwise, you may get back to the edition you found faulty by accident.

I'll try to stay available to answer questions for a few hours. It's now 5:45 PM, 11 July, 2023. Post here if you need to.

Okay guys .... after yesterday trying to get this fixed, without luck. I just threw out Exquilla, activated Owl and works like a charm!

Okay guys .... after yesterday trying to get this fixed, without luck. I just threw out Exquilla, activated Owl and works like a charm!

Yay!!! Congrats on finding that daring and successful solution to a widespread problem.

That beats the heck out of installing an older version.

Thank you for posting your solution.

I have the same problem as others have described here, but I have a few extra notes to make in the hope that this info will help others. First, when I start Thunderbird (102.13.0), all accounts appear and work fine (send and received) except the one account I have that uses Exquilla. That account (using Exquilla) does not appear in my Folders on the left side of Thunderbird. I learned through hours of desperate fiddling around that if I send an email to that problem account, from another of my email accounts, with Thunderbird open during this process, then Thunderbird will pop up a window showing that I have new mail. Clicking on that new mail notice causes Thunderbird to instantly update its Folders panel, now showing the Exquilla-related account that was previously not shown in the Folders panel. My received emails are there, but I cannot send emails through that account (I can send through all other accounts). When I look at the Error Console on the Exquilla Add-On panel's settings, I see many errors saying, ""invalid value for enumeration writeMode" and pointing to a few specific lines in "ewsUtils.jsm". See attached image of the error log. I hope one of the Thunderbird or Exquilla programmers will simply look at their error logs because it seems to point directly to the offending code. BTW, I wish to add here that I've emailed Exquilla Support twice in the past few months and never received a reply.

@dfcurry I had exactly the same problem, by luck I found out that when clicking on the pop-up window when mails comes in the account would appear but still had, just like you problems with sending. Try Owl, it worked for me ;-)

@dfcurry and @Muriel11

Thank you both very much for posting these findings.

I hope (trust?) that the developers are hard at work repairing the code errors dfcurry cites, if those errors are indeed in the TB code, and that the next update will be less problematic for all of you Exquilla/Exchange users.

I forgot to mention one possibly important detail in my message above. I first noticed this Exquilla-related problem yesterday on 11 July. Looking at the "Details" page for Exquilla in Thunderbird's "Add-ons Manager", I see that the latest version of Exquilla, 115.0, was auto-installed one day before, on 10 July.

@pitou1 @dfcurry

See the pitou1 post well above this. He/she noticed that update, too, and wondered about it, too.

My searches yesterday turned up tons of complaints about Exquilla and almost nothing (except here) about Thunderbird 102.13.0.

Workaround: Exquilla Support web pages do not provide access to previous versions of Exquilla. However, Thunderbird provides access to earlier Exquilla add-ons, which is a life-saver in this current situation of Exquilla failure.

https://addons.thunderbird.net/en-US/thunderbird/addon/exquilla-exchange-web-services/versions/

After removing the Exquilla Add-On from my Thunderbird installation, I downloaded the previous version of Exquilla, version 102.1, and installed that add-on. Now, I have full email Send and Receive capability, and TB shows my Exquilla-based account in the Folders panel. Everything is now working as it was before Exquilla's broken update (v 115.0). If you do this, be sure to turn OFF the automatic updates of Exquilla on the Exquilla Settings panel.

Hello, there was an Exquilla update this week-end. It partially solved the problem in a sense that I can now send e-mails and the content appears normally. However, when I start TB, the Exchange account does not appear. I need to send a mail to myself from another mailbox. It is only by clicking on the received mail that the mailbox appears along with all folders.

dfcurry, thank you for posting that information.

I don't represent Exquilla, but as noted above there is a new version at https://addons.thunderbird.net/en-US/thunderbird/addon/exquilla-exchange-web-services/ that indicates it should work for both 102 and 115.