Thunderbird Community Forum

This is maddening. A couple of days ago TB started to freeze. I have not added any new add-ons. I don't even have any add-ons. I tried one suggestion of repairing and compacting folders and that did not help. I also tried the accessibility.force_disabled change from 0 to 1. It is still happening. I have to use Task Manager to shut it down because if I right-click and close it tells me that TB is already running but not responding when I try to restart it. It takes 4-5 tries to get it to the point where I can have a few minutes to do anything in the program. If I leave and come back, the mail window is frozen. Help, please! I have been using TB for years and never had this problem!

I have what may be a very simple question. Say I receive an email in which I am one of many people getting the message - as in a message that has gone out to all 10 members of some committee of which I'm a member. I would like to make an entry in my personal address book for the Committee that would include all 10 addresses. Is there an easy way to do this besides (a) individually saving each of the addresses for the Committee members and (b) creating a new address book entry and (c) individually adding each of the 10 committee members? Thanks!

So I have a self hosted Exchange and I have no problems using it from apps like Google Mail, Outlook and such, plus I can login directly to its .../EWS/Exchange.asmx through a browser. However, when trying with Thunderbird 145/Linux, I always get that username or password are incorrect, but it doesn't tell me exactly what went wrong and how it tried, so I'm in the dark why it is happening. Note: exchange's url is on a different domain than my account.

Basically it's either this message: Authentication error.

Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIMsgAccountManager.createIncomingServer]

Or similar if I try to get message from inbox.

Also weird things happen during configuration, like attached image (note that I've tried different URL permutations)

TLDR; how do I diagnose the issue, or ever better, how to connect? TIA

Right after typing my email address and pressing "Continue", Thunderbird crashes. I wanted to give it a try after many years of not using it, but then it crashes right at the start.

Here's the crash report:

AdapterVendorID: 0x106b AvailablePhysicalMemory: 6554927104 AvailableSwapMemory: 1233125376 BackgroundTaskMode: 0 BuildID: 20251016001905 ContentSandboxCapable: 1 ContentSandboxLevel: 3 CrashTime: 1760704144 DOMFissionEnabled: 1 DOMIPCEnabled: 1 EMCheckCompatibility: true EventLoopNestingLevel: 1 GpuSandboxLevel: 0 GraphicsNumActiveRenderers: 0 GraphicsNumRenderers: 1 HeadlessMode: 0 InstallTime: 1760652930 LastStartupWasCrash: 0 MacAvailableMemorySysctl: 91 MacMemoryPressure: Normal MacMemoryPressureCriticalTime: Unset MacMemoryPressureNormalTime: 1760704136 MacMemoryPressureSysctl: 1 MacMemoryPressureWarningTime: Unset Notes: FP(D10-L1000-W0000000-T01) WR? WR+ GL Context? GL Context+ ProductID: {3550f703-e582-4d05-9a08-453d09bdfdc6} ProductName: Thunderbird PurgeablePhysicalMemory: 465715200 RDDProcessStatus: Running ReleaseChannel: release SafeMode: 0 SecondsSinceLastCrash: 825 StartupCacheValid: 1 StartupCrash: 0 StartupTime: 1760704136 SubmittedFrom: Client TelemetryEnvironment: {"build":{"applicationId":"{3550f703-e582-4d05-9a08-453d09bdfdc6}","applicationName":"Thunderbird","architecture":"aarch64","buildId":"20251016001905","version":"144.0.1","vendor":"Mozilla","displayVersion":"144.0.1","platformVersion":"144.0","xpcomAbi":"aarch64-gcc3","updaterAvailable":true},"partner":{"distributionId":null,"distributionVersion":null,"partnerId":null,"distributor":null,"distributorChannel":null,"partnerNames":[]},"system":{"memoryMB":65536,"virtualMaxMB":null,"cpu":{"extensions":["hasNEON"]},"os":{"name":"Darwin","version":"23.5.0","locale":"en-IL"},"hdd":{"profile":{"model":null,"revision":null,"type":null},"binary":{"model":null,"revision":null,"type":null},"system":{"model":null,"revision":null,"type":null}},"gfx":{"D2DEnabled":null,"DWriteEnabled":null,"ContentBackend":"Skia","Headless":false,"TargetFrameRate":60,"textScaleFactor":1,"adapters":[{"description":null,"vendorID":"0x106b","deviceID":null,"subsysID":null,"RAM":0,"driver":null,"driverVendor":null,"driverVersion":null,"driverDate":null,"GPUActive":true}],"monitors":[{"screenWidth":2560,"screenHeight":1440,"defaultCSSScaleFactor":1,"contentsScaleFactor":1},{"screenWidth":3024,"screenHeight":1964,"defaultCSSScaleFactor":2,"contentsScaleFactor":2}],"features":{"compositor":"webrender","hwCompositing":{"status":"available"},"gpuProcess":{"status":"unused"},"webrender":{"status":"available"},"wrCompositor":{"status":"available"},"openglCompositing":{"status":"available"},"omtp":{"status":"unused"}}},"appleModelId":"Mac14,5","hasWinPackageId":null},"settings":{"blocklistEnabled":true,"e10sEnabled":true,"e10sMultiProcesses":8,"fissionEnabled":true,"locale":"en-US","intl":{"requestedLocales":["en-US"],"availableLocales":["en-US"],"appLocales":["en-US"],"systemLocales":["en-IL","he-IL"],"regionalPrefsLocales":["en-IL","he-IL"],"acceptLanguages":["en-US","en"]},"update":{"channel":"release","enabled":true,"autoDownload":true,"background":true},"userPrefs":{"browser.search.region":"DE","network.http.microsoft-entra-sso.enabled":false,"network.trr.strict_native_fallback":false,"widget.content.gtk-high-contrast.enabled":true},"sandbox":{"effectiveContentProcessLevel":3,"contentWin32kLockdownState":3},"addonCompatibilityCheckEnabled":true,"isDefaultBrowser":null,"defaultSearchEngine":"ddg","defaultSearchEngineData":{"loadPath":"[app]ddg","name":"DuckDuckGo","submissionURL":"https://duckduckgo.com/?q="}},"profile":{"creationDate":20377,"firstUseDate":20377},"addons":{"activeAddons":{},"theme":{"id":"default-theme@mozilla.org","blocklisted":false,"description":"Follow the operating system setting for buttons, menus, and windows.","name":"System theme — auto","userDisabled":false,"appDisabled":false,"version":"1.4.2","scope":4,"foreignInstall":false,"hasBinaryComponents":false,"installDay":20377,"updateDay":20377},"activeGMPlugins":{"dummy-gmp":{"version":"0.1","userDisabled":false,"applyBackgroundUpdates":1}}}} Throttleable: 1 TotalPhysicalMemory: 68719476736 UptimeTS: 7.916666666666666 Vendor: Mozilla Version: 144.0.1 useragent_locale: en-US This report also contains technical information about the state of the application when it crashed.

I already have Thunderbird installed on a laptop. IS it possible to export my inbox and view the emails on a desktop without having to create an email account on the desktop?

I can't send Free-online emails on Thunderbird/Macbook, although I can receive them (see Error notification attached). I checked the Outgoing server settings in the Accounts settings which seem right (relay.free-online.net). This has been happening for about a week. Thanks for your help.

Hello,

I'm using Thunderbird in Debian GNU/Linux 13 (trixie).

Version: Mozilla Thunderbird 140.4.0esr

apt package: thunderbird/stable-security,now 1:140.4.0esr-1~deb13u1 amd64 [installed]

The last few weeks I started getting the problem that Thunderbird freezes, it stops responding and Debian (with the default gnome UI) shows a popup window saying "Thunderbird is not responding", then I wait for about 10 or 20 seconds, and then Thunderbird becomes responsive again.

Apparently Thunderbird is doing something that takes a long time (perhaps going through messages to index them for quicker search or something like that, I don't know), something that should be done in a background thread so that the program can remain responsive, but for some reason that heavy work is done by the main UI thread causing Thunderbird to become unresponsive.

This problem has gotten worse over the past few weeks, so I really want to do something about it before Thunderbird becomes completely useless. (At the moment I can still use Thunderbird for like 10 minutes in between the freezing, so it's not yet critical.)

How can I find out what Thunderbird is doing while the "Thunderbird is not responding" is shown?

For example, is it possible to configure some logging or performance profiling that would output to a file some information about where the program spends its time?

Other ideas about how to troubleshoot this?

I'm using the latest version (145) and I've setup my office 365 email account. I'm trying to setup my calendar account as well but when I enter location, username and password it says that my credentials were not accepted.

I assume this means that TB is using legacy un/pw authentication which is no longer supported instead of OATH2. There is, however, no option to select OATH2 in the calendar setup process (like there is for email).

Are office 365 calendars supported by TB 145?

trying to actualize my Thunderbird account I should close but was not able to do it because I could not find any possibility to do so. Then tried to get help and was asked to open an account. By doing so I got a reply: Bad Request 400. I do not need a new account, just want to actualize mine. Could you please help?

Dear all,

It happened to me twice that the e-mais in the Inbox disappeared. Yet the Inbox showed that I still had 4 unread e-mails.

I installed the latest Mozilla Firefoxx update and now many saved e-mails in folders disappeared. All foders in alphabetical order after F cannot be founc no matter how much I scroll down. What can I do? Help!

Thank you very much for your help.

When I add attachments when replying to emails, the file icons on those attachments don't display. This only happens when replying, the file icons display when receiving emails. Have tried many things to fix this including using ChatGTP with no luck. What can I do to fix this?

Hi Guys, please help to fix a very strange problem, that more and more Emails don't match up with the Sender and show different Message content (see attached Screen Shots) Never happened before ... why now ?? Thanks in advance, Werner P.S. my Thunderbird Version is 128.9.1est (64-bit) and my iMac is on Sequoia 15.5

I was trying to change the time emails are kept on the server so I went into "Account Settings" and now Thunderbird is locked onto this page. I get a "Mozilla Thunderbird not responding" message when I try and click on anything and I can't get out of this page nor access my Inbox. I've tried starting Thunderbird in Safe Mode which didn't work. I then uninstalled and reinstalled the latest version of Thunderbird but when it starts it goes straight back to the frozen "Account Settings" page. I've checked my profile and there is a new profile that was created with today's date. There is also a profile from June 2025. If the old profile contains all my emails and folders up to yesterday, that would be OK.

passwort wird nicht mehr akzeptiert .habe pckommplett zurück gesetzt win11 jetzt weiss ich passwort nicht mehr 7thunderbird sendet mir zahl auf handy und ich betsätige und was dann???

I have been using Thunderbird for many years, but 3 days ago my Thunderbird icon disappeared from my desk-top and I could not find Thunderbird among my programs. This included my email storage folders. This also happen on my wife's computer at the same time. I searched for my emails and found them through google. It was just a list with no organization or folders. I took my computer to a well established computer shop for them to investigate. The next day my wife's computer was just fine, icon was back on her desktop, emails in order and her storage files were back. I am trying to reinstall Thunderbird, but I'm getting nowhere. Please help! Sending me an email won't work.

Sorry for the long=winded message but I figured it would save time to explain the steps from the beginning.

I've been using Thunderbird as an OSB for my archived messages from Apple Mail. In that scenario I create a .mbox file of all messages I want to save from a particular year and then import that into Thunderbird into a local folder with the year as the folder name. The version of Thunderbird where I was doing that is 115.10.1

I started testing Thunderbird version 139.0.2 as an Apple Mail replacement with only 2 of my email accounts.

Now I want to convert entirely out of Apple Mail. First I made a backup copy of the entire Thunderbird folder located in the User/Library folder onto an external hard drive that I then disconnected from my computer.

Then I downloaded the latest version 145.0 (aarch64) and installed it. (I still have the other 2 versions on my system) I opened it up and got into the profile manager (troubleshooting then about profiles) and discovered that I have 4 of them. I made the one that contains my archive the primary one. It does not have any connections to a live email account. I've only ever imported an .mbox file. Everything that I've archived is there. This is profile Number 1. I renamed it Archive so I could keep track of it.

Then I opened up each of the other 3 profiles in a new browser in sequence to see what they were.

It appears as if I have one that is empty. it opens up wanting me to set up an existing email address. I closed that one down. It's called Profile number 2.

The next one appears to be the current one for the 2 test email accounts. It has them properly configured, showing messages in the inbox and with the messages that are supposed to be archived off in the local folders I had created as I expect. I am calling this one profile number 3.

The third one first had me add the passwords for the 2 test accounts and then it is pretty close to number number 3 but is missing some of the local folders. This is called profile number 4.

Want I want to end up with is 1 profile. I would prefer to start with the one that has all my archive messages in their local folders, and then add the test accounts including all their messages from profile number 3 with its local folders. Once they are safely moved and part of the Archive profile I would like to delete all three numbered profiles. Once I am down to only one active profile and no others lurking about I plan to slowly start adding the rest of my email accounts moving them one by one out of Apple Mail and into Thunderbird.

I've read the various articles on moving out of Apple Mail into Thunderbird So I believe I can add the Apple email accounts to my Archive profile successfully. I have the import tools so I can import the .mbox files from Apple mail into those accounts.

Where I'm stuck is I can't seem to find an article that gives me detailed instructions on how to combine profiles within Thunderbird. All the articles imply keeping multiple profiles active and I would prefer not to do that.

I am sure I am just not searching properly but I am at a loss as to how to proceed. I do not want to delete any profiles or start adding more accounts until the profiles are cleaned up.

Thanks for reading this long explanation and I appreciate any help anyone can provide.

Hello, In Tbird 145, my calendar does not show the column header for the weekday 'Friday'. All six other headers are displaying correctly. This is also occurring when 'Workweek days only' is selected. Thank you.