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My Thunderbird (version 115.12.2) is running on a Windows 11 system. My profile has multiple accounts configured as IMAP to multiple email services. I also have the Status Bar and Activity indicator enabled. Randomly, both indicators will show busy for an extended period of time. When I view this in the Activity Manager I see one or more folders hung for 10 or 20 minutes downloading one message out of several. This occurs in multiple accounts and servers.

I have researched this and attempted the fixes presented. I have cleared the cache files and compacted and rebuild email folders as suggested, but the slow update still occurs.

Then I decided to try and capture a ProMon.exe trace to see what is happening. What I found was Thunderbird.exe was spending all of the time while hung access the following file: C:\Users\MyUser\AppData\LocalLow\Intel\ ShaderCache\4a5eb0e65e559fc08e65ecb2fa9d650817ae895582a7a7ede162866d3e47a05a, like it was stuck in a loop.

When Thunderbird is operating normally, it is accessing this file but only for short period of times. Research says that it is ok to delete the files in this folder. I did that and it seemed to help for awhile. But it started happening again.

Does anyone have any idea what could be causing this? Is there a Windows thing to look further into? Any help would be greatly appreciated.

For a few days now, synchronization and opening new messages from a Gmail account configured in Thunderbird have been very slow. I use Thunderbird 140.x, which is regularly updated, and the mailbox has been configured for at least 5 years. Only in the last week has the problem emerged, rendering it unusable. Timeout errors and opening a new message after 2-3 minutes. I've cleared the cache, the database, and re-indexed, but nothing has changed. I've deleted and reconfigured my Gmail account, but nothing has changed. My Gmail mailbox is about 45 GB (I've seen much larger ones without losing performance). I tried installing Thunderbird on a new, clean PC, but the same thing. Extremely slow. Google support hasn't found any issues. Do you have any other suggestions for getting Thunderbird back up and running? Thanks.

Hi,

i am despairing.. - since saturday our mozilla thunderbird is no more working. No more new mails are reaching or can be sent because we lost the connection to IMAP server with need of entering password, but regular password and also new main password are not accepted

I also tried to minimize server connections, deleted cache, tested older and newer versions of mozilla thunderbird, tested other authentification modes which none others than the given in the reference are acccepted from mail server: wp1140969.mail.server-he.de, Port 143 - outgoing server: the same, Port 587 - worked since years. Only thing i could not try as to adapt Firewall rules of Windows Defender, because i can not find mozilla thunderbird in the shown app listing.

What else can i do? Please help. Best regards Markus

Thunderbird (140.2.1esr) suddenly stopped downloading emails on 8th Sept 2025, although new emails are still accessible on my email server's webmail, suggesting the problem is with Thunderbird not accessing the server. Sending messages in Thunderbird is unaffected. Have tried every solution I can find online, but problem still persists. When I click 'Get messages' , at the bottom it says 'Host contacted, sending login information', then 'Checking inbox for new messages', then 'No messages to download'.

Hi, Admin

Please help me with my missing folders on my mobile app. I have exported the settings from my desktop to my mobile and the only folder I have is Outbox. I have uninstalled the app but that did not solved the issue and manage folders as well. Regards BI

Здравствуйте. Случайно сделал несколько копий одной папки с частью других вложенных в нее папок. Назад переместить не получается т.к копия уже содержится в основной папке. Как удалить дубликаты?

Hi there,

Yesterday Tbird updated and since then anytime I restart it it crashes. I tried to restore from a backup the previous version and was told the profile was different? I also loaded up Betterbird but no messages are displayed in any of the accounts/folders.

On another PC Tbird doesn't display any messages as well.

on my laptop it is 142.0 build 20250813171833 on desktop Betterbird is 140.3.0esr-bb11 build 20250913192149 on desktop tbird version I don't know what version it might be whatever is being pushed out as I tried to download a new installer yesterday.

I can see mail coming in but nothing gets displayed and I'd really like to get my mail back with one mail client.

Any ideas what to do before I attempt a system restore of thunrderbird and its data areas?

thanks leon

I save old messages into sub directories by year. I find that if I had a single graphic or something as an attachment it nullifies everything in that group showing no mail at all. Further it starts to replicate the file names especially if I change the name of the directory. I enclosed what I mean, its ruining the mail inside, I can't read the file. I really wish this program didn't combine all the messages like it does into one file but instead had the option to keep them all apart.

But right now its broken, I don't know how many versions this goes back and i'm hoping there will be a fix and something to repair the damaged files. And no repairing folder doesn't work. I spent 2 hours trying to get back important information and I couldn't fix the issue. I had to finally get the text chain as a single message sent back to me so I can see everything. But I can't keep doing that.

Can someone look into this? Copilot had lots of ideas but there is clearly a bug in the system.

---Mike Savad

Hello, I updated my Thunderbird from 142 to 143.0 this morning. Since then, most of my folders have disappeared, including my inbox, sent items, trash, etc. In fact, almost everything except for a handful of seemingly random folders that still exist. When I play around with the folder view (View => Folders), it doesn't really change anything. Possibly interesting: I cannot select ‘All Folders’ in the folder view.

I use POP and have combined several accounts into shared folders. These are from GMX and Ionos/1und1.

Of course, I immediately tried to reinstall the latest version 142, but this did not work because version 143 had already manipulated my profile. I received an error message saying that the profile was already being used by a newer version (or something similar).

I have been using Thunderbird for about 20-25 years, so the folder structure is naturally quite old and complex. I use it for work. My Thunderbird profile is 3.5 GB.

Can anyone help me? The best solution would be for my profile to be fully functional in 143. Alternatively, it would also help me if I knew how to make my profile, which has already been manipulated by 143, fit for 142 again. Thanks in advance.

PS: I use Windows 11 Home. And of course I have a backup of my profile. However, I am abroad and the backup is at home, and by the time I get back there, it will be 3 weeks old.

Translated with DeepL.com (free version)

Каждый раз при запуске программы начинается индексация всех писем в почте, это занимает большое количество времени и в это время я не могу экспортировать письма. На почте достаточно большой объем данных за несколько лет, но возможности архивировать часть нет, поскольку эта информация постоянно используется в работе. Есть ли какие настройки, чтобы индексировать не весь объем писем, а например, за определенный период?

Am getting the following since updating to the latest ESR version 140.3.0esr (32-bit)

Sending of the message failed. The message could not be sent because the connection to Outgoing server (SMTP) smtp.mistral.co.uk timed out. Try again.

No settings have changed. It has an exception for Security Certificates which is why I used TB for my emails.

I note other people have this issue too.

Bonjour J'ai 2 questions à vous poser concernant ma messagerie de Thunderbird. Je reçois depuis une quinzaine de jours très peu d'Emails. Il semble que le chargement ne se fasse plus normalement dans ma boîte de réception. Dois-je autoriser les demandes d'autorisation de modification du disque dur que vous me transmettez de temps en temps ? Merci de traduire en anglais cet Email que je ne pris écrire en cette langue. Cordialement.

JP Grandsire

I can't receive or send e-mails. The software asks for a password for pop.orange and none of the passwords I have works. I am thus in a no-man's-land. Perforce, I use the Orange e-mail client, which hasn't the capabilities of the Thunderbird client. . The other facilities - addresses, calendar, all work.

I shall be grateful if you would please direct me to a fail-safe solution enabling me to arbitrarily impose a password which I can generate using Norton password manager, and once again receive and send e-mails?

I have been trying to filter out and delete emails with certain URLs in the HTML section of the body of the message.

I can get the Body filter to activate and delete the email if I send the specified URL within a simple text message. So the Body filter can activate on sequences in the text part of a multimode or simple text email.

It doesn't, however, seem to activate for the thing I truly need, which is to see a URL (or other sequence) in the HTML part of a multimode. It appears to ignore the HTML section.

Would it be possible to either:

1) allow the current Body filter to scan all parts of a multimode message? OR

2) create a new filter, perhaps named Rawbody, or Raw, etc., which doesn't break down and separate the parts of a multimode first, but simply does a raw scan of the entire body: text, HTML, and all?

Thank you.

Hi all:

I was running thunderbird (v128.14.0esr) installed from Debian 12 (bookworm) repositories with no problems. My profile folder is on a network drive, I know this is NOT recommended but I am the only user and this configuration has worked flawlessly for several years. Recently I upgrade to Debian 13 (Trixie) and installed the flatpak version of thunderbird (v140.3.0esr) to get the more current version than in Debian 13 repos.

My problem is when starting the flatpak version, I get error "Thunderbird is already running but not responding". The "ps -ax" command does NOT show any process with thunderbird in the name and I cannot figure out what is wrong.

Here are the contents of my flatseal configuration/overrides file: [Context] sockets=inherit-wayland-socket;session-bus filesystems=/mnt/fserver/Applications/Mozilla/TBird/Profiles/Default;home;host-etc;host-os;host

[Environment] MOZ_NO_REMOTE=1

My profile is located at /mnt/fserver/Applications/Mozilla/TBird/Profiles/Default and I can access it from my Debian system.

Any suggestions would be greatly appreciated.

Hey all,

For about half of the notifications I get from my google calendar, I get a dialogue warning me that the item has changed on the server and I can submit my changes anyway or discard and reload. It doesn't matter what I choose - the pop up goes away and reappears at the next notification.

I have searched for other reports of this issue and seen it reported many times in the last few years. I have tried all of the known solutions but none of them seem to fix the issue for me.

Here's what I've tried:

- Unsubscribed and resubscribed to the google calendar - Unsubscribed, shut down Thunderbird, deleted the calendar-data folder from my profile, opened Thunderbird, and resubscribed to the google calendar - Toggled "Read Only" every which way - Toggled "Offline Support" every which way - Turned off show reminders (which fixes it of course but I want reminders, that's the problem) - Deleted the offending events in my google calendar and recreated them from scratch - which has returned the same "item changed on server" warning.

I don't know what else to do at this point. I don't see any new reports of this issue so am I just missing something fundamental here? Do people not use google calendar in Thunderbird? Is it known to not work if you have an iPhone that also shows calendar notifications or something?

My desktop specs are Windows 11, everything at latest, no additional calendars other than "Holidays in the United States" (which I think comes with Thunderbird), and the BorderColors D extension to change colors of my email border depending on which address I'm sending from.