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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.

I am having severe problems downloading and syncing my emails with TB 142.0. I opened TB this morning, for example, and it took more than 20 minutes for it to download my emails. When I go to the next email, it takes a couple of minutes to load it. I have had some issues with slow syncing before, but this is very bad. I note that the emails work fine on my phone. Also, this happens on my main Gmail hosted account, but also on my other Siteground hosted accounts. TB seems to be lost in some kind of loop when syncing.

I'm on the Release channel, but was updated to 142.0 Beta. Surely this is wrong. I am not on the Beta channel. I just want to stay updated to the most recent stable release.

1. I am new to to using Thunderbird and have been using it for about 2 months. As of today I am using Ver. 142.

My replies to emails generates two copies in the "Sent" folder and in some cases, duplicate copies to the recipient. This duplication is inconvenient and embarrassing especially when replies are also duplicated to the recipient. The previous replies I have found to what appears to be a not uncommon question are some years old or apply to previous versions of Thunderbird where the software version, settings and options may have been different.

How can this duplication be prevented in 2025 and the latest version of the software?

2. Having not found any recent answers to the above question, I signed up to Mozilla/Thunderbird support. The registration process first declined the "Confirmation Code" and the window closed. (The code was copied and pasted therefore no error). In an effort to clarify whether the registration had been successful I attempted to log in via a new window - the email address and password were accepted.

However, the username (?) apparently a derivative of the email address used, appears in the top right corner of the Mozilla Support window: https://support.mozilla.org/en-US/questions/new/thunderbird/form) contained an unexpected additional digit.

Is the additional character necessary for some reason or is that another bug in the interface?

Thank you P W

I cannot delete certain emails. next after a few hours content disappears and then those emails also cannot be moved or deleted. I have stopped receiving emails on my phone as well.

I noticed that when I get calendar invites from people in Mexico or I happen to be in Mexico (I travel full time), the timezone data is incorrect. I assume that the default timezone data for firefox does not account for Mexico abandoning daylights savings in 2022. How can I update this?

I'm just trying to use IMAP to download all of my email from Yahoo and then I plan to save a local copy.

It's fairly large set of mail - Yahoo says about 21 GB.

It will spin for a day, but then I come back to it and it seems it has started over.

Then I looked in Activity Monitor, and I see where a bunch that has been downloaded is then deleted.

Huh? Why? I don't really see any change on Yahoo web server, sort of as expected based on IMAP - but why is Thunderbird churning this over and over without ever completing?

Now that Thunderbird is delivered in .xz archives, not .bz2, the Linux system install instructions need updating. The extract command in Step 3 should be:

tar xJf thunderbird-*.tar.xz

note the upper-case J instead of lower-case which is used for .bz2

In an IMAP account I can create subfolders in all folders except the inbox. Subfolders created in the inbox become folders at the same level as the inbox. TB 140.2.0esr Screenshot of server settings, advanced attached.

Thanks

je reçois ce message chaque fois que j'ouvre thunderbird sur ma messagerie de l'ordinateur :

voir message téléchargé . que faut_il que je fasse merci pour vos conseils daniel duprat

in inbox suddenly some mails became empty and cannot be deleted nor moved nor archived, other messages not affected. It happened earlier and was asked to delete the inbox folder, that worked. But again same problem happening on the same email account, other accounts no problem. See screenshot, the bad ones have red star. Clicking on bad ones: empty screen. MacBook Pro latest OS and software

I hope I can explain this well: Recently, many recurring events from Google Contacts, namely birthdays and anniversaries, now appear in Google Calendar as invitations from "Unknown Organizer <unknownorganizer@calendar.google.com>" that I have accepted (but I have not.) These events keep triggering pop-up notifications. Those notifications do not respond to the Dismiss or Snooze buttons - they do nothing. I can dismiss the dialog box with the upper-right [X], but the pop up gain every time the calendar re-syncs. I try to edit the properties of the event, but the changes do not take. When I look at Google Calendar directly with my browser, these events do not show up, only the proper ones that are listed in my Birthdays calendar.

Why did this happen, and how can I fix this. The un-dismissable notifications make Thunderbird Calendar unusable. I find many similar (but not necessarily identical) complaints going back years, but no actual solutions.

Thunderbird 140.2.0esr Windows 10 22H2 Cardbook address book add-on 100.4

How do I attach multiple files, i.e. select more than one attachment at the same time rather than adding them one by one?

I can do that with every other app - e.g Word or WhatsApp, but not with Thunderbird.

Very simply, I want to use Insert, Image then click to select multiple files, but found no way to do this.

It seems that no way currently exists, if so could this please be put on the "to do" list for the next release?

Hi, Just got computer back from shop where - rather than upgrade - they did a clean install of Win11. I was under the impression from them they'd backup everything on a new "backup" drive they installed to double my capacity as part of the upgrade process.

They're version of backing up Thunderbird left me with a folder "Thunderbird_profile_backup.zip" that is 9,698,657kb in size.

I am attempting to install Thunderbird on the essentially new computer and restore all data from the previous installation.

Is this even possible anymore at this point?

I have data in that file that is important not only financially but archived family info from now deceased members... I'd really like to recover it.

In short help! lol.

Mark

For months now, when deleting emails in Thunderbird, it sometimes creates multiple records of the same deleted email in the Deleted Messages folder, sometimes several hundred copies of the same email. It doesn't do it for all deleted emails, and I have not been able to discern any pattern or cause. As a result, my wife's Deleted Messages folder has 8,700 deleted emails in the last 3 months, far more emails than she receives. Edwin Miller

Att made me change my account password. Now Thunderbird cannot access messages. I have entered the new password in out going and incoming but there seems to be more to this than that because nothing happens. Where do I have to put in new passwords? Thanks so much. Marjorie