Thunderbird Community Forum

I have an 8 year old PC that I have been using Thunderbird on its entire life. I have 5 email accounts (from my own website if that matters) on it for personal use that have tons of information.

I bought a new computer and have not been able to move my old data to it. The old computer uses Windows 10 with Thunderbird Version 115.5.2 (32 bit). The new computer uses Windows 11 and I have tried several Thunderbird versions with the current one being 128.12 0esr (32 bit). I have added one of my email accounts to my new computer, but it contains none of my previous data (emails, contacts, directories, etc.), just a bare bones account that only receives new email.

I have repeatedly tried to move my entire source computer setup and data going through all of the described steps including copying the previous Thunderbird folder to a flash drive. I then follow the directions for copying and pasting my source data into the new computer's "roaming" section. It goes through all the steps including asking if I want to overwrite existing files. I have almost 14,000 files and as the process continues, I can see file names being added just as I would expect.

After everything is complete, when I restart Thunderbird, the only access I have is once again to the bare bones new email account. There is no data, nothing at all, from my source computer.

Help please, this has gotten beyond frustrating.

Have just installed TB for the first time (replacing WLM) and am very happy with it. My only problem is that the option to open with a blank page is not working despite leaving the checkbox unchecked. I've tried checking and unchecking but it makes no difference, it always opens with the full setup options displayed. Is there another way to have TB open with a blank page?

For >20 years I have used Thunderbird as my email reader for various email accounts on my mac laptop. Last night Thunderbird stopped downloading emails from my yale.edu account. I tried removing the yale account and reinstalling it unsuccessfully. See attachment. The Yale IT rep told me that Yale very recently added security features that are probably preventing Thunderbird from working with it. They told me to use the Outlook app. Is there anyway I can get Thunderbird to work with my yale.edu outlook email account?

Certificate errors have been an ongoing, several-times-a-day frustration for me and other users, with different ISPs, since approximately June 25. Is anyone working on this bug? Because it clearly is a bug: Not only I but several other users have reported that Thunderbird worked fine until that date, then stopped working fine. What changed, and can it be put back the way it was, or can we receive some explicit instructions on how to fix it for ourselves? It's making Thunderbird borderline unusable. Every time I try to send a message, I have to confirm a security exception, then send it again. Several times a day, when I try to fetch messages, I have to confirm security exceptions. The confirmations never seem to stick. This is some BS.

I am able to style tasks that are either completed/overdue/inprogress in userChrome.css . But so far I have not found a way to style canceled tasks.

Can someone help me ?

TB on PC: have noticed that my Calendar entries are not syncing up to Outlook.com. Entries added directly to Outlook.com sync okay to my PC TB. Contacts sync works fine both ways. I just upgraded to TB 128.12 but no change. I have checked all the TB Outlook server entries and they appear correct. Any ideas? Thanks.

Could someone please tell me what the latest version of Thunderbird is on the Release Update Channel? I am on version 139.0.2, and when I check for updates in the app, it says that Thunderbird is up-to-date. Is version 140.0 not going to be available on the Release Update Channel?

With the latest updates, the client no longer accepts the self-signed smtp certificate as exceptions. The server is old and there is no way to upgrade to a newer one. It is also not possible to connect a third-party certification authority

I suspect there is no fix and I (possibly) can restore from backups, but I would sure like to know what the issue is.

I tried retrieving an e-mail from the "folder" where I kept e-mails from 2023. The "index" one sees displayed for the folder had e-mails from Jan-Mar of 2023, but Thunderbird froze when I tried to open any of them. I tried the repair function (which I imagine is meant to rebuild the .msf file), but after than the index contained nothing from Jan-Mar. I opened both the .msf file and the no-extension file in Notepad, but I see nothing from those months.

Any clues/help would be appreciated.

Hi, I am trying to use Filelink to send a large file. I selected WebDAV and am trying to log in there on Mozilla's Composition screen. Under Private URL it wants me to enter my username and password. I entered my email address and password but error message says account not properly configured, What am i supposed to do?

This has happened the last two times I've tried to write a reply. I will be writing along and all of a sudden the screen dims and I get the blue circle thingy. Thunderbird locks up and doesn't come back but the red exit button is available. Of course, I lose all the reply I've written. I've never run into this error before and I've been using Thunderbird for years. I'm running v. 139.0.2 (64-bit) on a win-11 laptop, Firefox in the background but no other programs running. I clear my cache at the beginning of every month, so I did that this morning before starting any programs.

Hello, I have Mozilla Thunderbird version 128.12.0esr (32-bit) on a Windows 10 laptop On the Help/About Thunderbird it says update failed. I have clicked on download and have version 139.0.2 in my downloads folder. When I try to install it all goes well until I get a message "Your computer must be restarted to complete a previous uninstall of Thunderbird. Do you want to reboot now?

Yes No " I have rebooted several times now with the same results. What do I need to do to get the update Regards Peter Norris

Thunderbird 128: After creating the mail group name the open address book is grayed out when I attempt to add addresses to it. I can add the contacts manually by typing them but the group cannot be saved.

Since 17th June any email I send to an hotmail account is being returned with the message

This is an automatically generated Delivery Status Notification.

Delivery to the following recipients failed permanently:

  * (removed)@hotmail.com

Reason: A message that you sent to the following recipient could not be delivered due to a permanent error. ** The remote server ?? responded with: ** (removed)@hotmail.com ??:?? This message was created automatically by mail delivery software on the server .

I have not made any changes, and it worked previously for years - do you have any suggestions as to the problem? I have tried sending to 3 Hotmail accounts and are all being returned - all other emails work correctly.

I am using plusnet.

I grew too used to the zebra striping pattern in my message list, but could not find a way of implementing it in Thunderbird settings. I'm using version 139.0.2 - aarch64.

I did try to use the code available in this forum, which involves creating a folder "chrome" in the user profile and then a file userChrome.css under it. I did turn on toolkit.legacyUserProfileCustomizations.stylesheets and understand this is not recommended, but it did not make any difference anyways.

Any pointer would be much appreciated.

I'm running Windows 10 and recently switched from the ESR Channel version (128.11.1) to the Release Channel version (139.0.2) and, since then, have started having a problem where the unread email count displayed on the system tray icon and also the count on the Taskbar icon are no longer correct. Most incoming, unread emails aren't counted. This feature has always worked correctly for me previously, ever since I first installed Thunderbird several years ago. When I go into Thunderbird, the count of unread emails in whatever folder they're in is still correct, the problem is just with the counts on the taskbar and tray icons.

I'm not 100% sure, but I *think* it might be the case that emails which end up in the default "Inbox" folder are added to the counts, but those which are automatically allocated on arrival to other folders on the basis of filter rules aren't being added to the counts displayed on the icons. I have searched for others reporting the same issue and haven't been able to find anything, so it seems unlikely that it's a bug. I'd greatly appreciate any help in resolving this issue please.

Recently, my SENT file has not been keeping the email I send. Has anyone else had this problem? Can anyone suggest how or why this has started happening?

I count on being able to look and see that I have sent or replied.

Thanks for any help, Jerry

Hope someone can resolve this "Thunderbird mystery" for me.

I just sent an email to 9 people. The message was a few paragraphs and would normally be 8.6 kb in size. (I know because I copied and pasted the body of the message into a "test" email, and TB showed 8.6 kb as the size.)

My message included an attachment of 58.0 kb in size. [It also included 3 links, but those shouldn't contribute more than a miniscule amount (just the actual letters in the link) to the size, right?]

Yet when I sent the message plus attachment (and copied myself), Thunderbird showed it as 5.3 MB (!) in size.

How can that be? Any help would be appreciated.

Andrew