Thunderbird Community Forum

I converted my old Outlook emails in to MBOX using the Syscurve conversion software, and then moved the MBOX file into my Local Folder for Thunderbird. When I open Thunderbird it sees the file, but does not see the folders or messages inside the file. The Local Folder has the following three files in it (plus the trash, etc.): output_20251127110416.mbox 4,194,310 kb output_20251127110416.mbox.msf 2 kb output_20251127110416.msf 2 kb Thunderbird shows the output_20251127110416.mbox in the Local Folder but says no messages found when I click on it. How do I get Thunderbird to see the mbox files?

I must be doing something wrong. I am new to thunderbird, migrated from Eudora since I can't send mail with Eudora anymore.

I tried to configure Thunderbird as much as possible like Eudora, but ... it doesn't receive nor send mail. On the surface it looks fine, it seems thunderbird logs into the server, it seems it sends mail and checks for new mail, only I don't receive anything, nor send anything even though it looks it does. So what am I doing (or is going) wrong? (I can still receive mail with Eudora and today I checked and received 54 mails, none with Thunderbird)

I have a filter set up on one of my computers with Thunderbird that copies all incoming emails into a local folder. I then have a filter on the local folder to mark those messages as read (see attached), but it doesn't work. Is there something I'm doing wrong?

with some changes with a default search for passkeys, I am no longer able to use thunderbird mail as is, as after spending three hours today, I was unable to add a 2nd account that has been accessed via gmail for a long time. I am wondering what other email problems other than thunderbird might have similar features,. as thunderbird has been rendered unusable by new code/passord, passkey requirements. I was looking at spark, but their interface is not as helpful. Thoughts! RIP Thunderbird mail, a long time friends, but time to move on, alas

I would like to donate .. i really would .. but .. I use PAYPAL for donations, and when I try to donate, the first thing you do is ask questions I'm not going to answer. I have an account already .. seriously that should be enough to give you money. OR if i go to paypal, have a donation link there.

I had to install Windows 11 fresh because of multiple issues with my PC (I upgraded from 10 to 11 6 months ago). I installed Thunderbird fresh, and am trying to get it to see my existing data with is on my D drive. I browsed to the folder in Account Settings, but it's not showing up. I have years of mail and don't want to lose it.

There are too many options in the help for me to know which are actually related to my situation. I thought I was ready to do this, but am surprised at how difficult it is compared to the last time I did something similar.

Any help, even just pointing me to the right place to look for help, is appreciated!

Thanks!

Have tried so many times to transfer from old laptop to new laptop, never works. Have watch the youtube videos and followed this. Can not get it to work. Just want the emails from the old to the new laptop Thank you

Method using a transfer device On your source computer Connect a device for data transfer, either a local one such as a USB flash drive, or a remote storage drive. Click the menu button Fx57Menu, then click Help and select Troubleshooting Information. Locate the "Profile Folder" entry, then click Open Folder. Your Thunderbird profile folder will open in Windows Explorer. Close Thunderbird. From your Thunderbird profile folder in Windows Explorer, go up three levels. Right-click on the Thunderbird folder and select Copy. Right-click the device you are using to transfer your data, then select Paste. If you are using a local transfer device, remove it safely from the source computer. Note: This steps can also be used to create a backup of your Thunderbird profile folder.

On your destination computer Connect the same transfer device you have used before to copy your Thunderbird profile folder from the source computer. Right-click on the copy of the Thunderbird profile folder that you created on the transfer device, then select Copy. Open Thunderbird (Close the account setup window if it appears.) Click the menu button Fx57Menu, then click Help and select Troubleshooting Information. Locate the "Profile Folder" entry, then click Open Folder. Your Thunderbird profile folder will open in Windows Explorer. Close Thunderbird. From your Thunderbird profile folder in Windows Explorer, go up three levels. Right-click inside the folder, then select Paste. When prompted, choose to replace your current data.

I somehow changed the actual email screen (where the message to send is) and have lost the "Send" button. How do I restore it? I tried to attach a screen shot and was unable to.

When I click on a mailto: link on websites, it defaults to an old email address that I am phasing out. So every time I click on a mailto: link, TB opens a new email using the old email address, and I need to remember to click on the list of my email accounts and select a different one.

How can I change the email address that is the default?

Thanks in advance! Clint

I have a Windows 10 machine, have been using Thunderbird and pobox for years.

In case you're not familiar with pobox, it is a mail forwarding service; I pay for an email address and they forward email to up to three servers. I've thereby kept the same email address for a very long time, just changed the address(es) they forward to as I change ISPs, etc. At some point I quit using my ISPs server for my email and just used the one at pobox.com. Pobox was purchased by Fastmail, and so they have some new server names; my old ones have continued to work on my current system.

I use POP3 instead of IMAP because I want the email on my machine, not on a server somewhere. I configured Thunderbird to do this long ago, and so I don't remember details; I've been depending on being able to extract any needed information from its configuration. I am confident I have the password correct; I can log into the web interface to my email, and the password works there.

My new machine is a dual-boot Win11/Ubuntu; my plan is to use the Ubuntu machine almost exclusively and only boot Win11 when necessary. I want to move email operations to the new Ubuntu machine.

I've read info on moving Thunderbird; I find the profiles on the source machine, move up two directory levels, find the equivalent directory on the new machine, copy with replace. I found:

c:\Users\name\AppData\Roaming\Thunderbird

on the Win10 machine, and

Home/snap/thunderbird/common/.thunderbird

on the Ubuntu machine, so I copied the files from the first to the second.

Having done that, when I start up Thunderbird, it displays a page saying "Set up your existing email address". If I do that, of course, it will create a new profile, and I still won't have the old one. I've tried creating it manually, but (a) I don't know how I will then merge it with an old profile and my thousands of email messages, and (b) I'm having trouble figuring out the incoming and outgoing server settings. I remember struggling with that back on Win7 or whenever it was.

Anyway. Anyone got suggestions on what might be going wrong here?

I am trying to upgrade from ESR to Release. I saved my profile successfully, went to the install page and clicked Download. Got a request to donate, which I did. Then I got a page saying Thank you, Finish installing and enjoy Thunderbird. But there is no way to finish installing and I never got a download file. I've tried multiple times, nothing happens. Help!

Thunderbird 145.0 (64 bit) with Windows 11 Pro.

In the message editor window, new message or reply or forward, when I want to insert a hyperlink using either CTRL+K or via the Insert menu, a popup window to insert the link into does not appear, and the write windows hangs. Becomes unresponsive. The only way to close it is by ending the task in Task Manager. I notice a crash helper in the Thunderbird group in Task Manager. Everything is on 0% CPU though.

What went on before this is that I modified the property editor.link_color in the config editor (because links are not readable in dark mode, but that's a different story). I then did reset it to default and restarted TB, then pc and TB, that did not help.

In troubleshooting mode, there is no problem. In normal mode, I deleted the only plugin I had (a theme) I cleared cache, refreshed Thunderbird, to no avail. It's not set up to generate crash reports yet.

I have TB on another machine (W10 Pro), I can copy my profile folder over quite easily.

Any suggestions please?

(I'm on Central European time, it may be a day or so before I respond to replies from the US.)

I have an unfamiliar name on my Thunderbird account of g*******k@hughes.net (I do not know this account) and I am able to see the inbox of this email on my computer in Thunderbird. I have been working with Hughesnet as I was without email service since 11/17/25 and have just been able to now Receive emails since 11/25/25, but am unable to SEND outgoing emails. Hughesnet requested that I contact Mozilla support as to the outgoing email issue - and the unfamiliar name on my Thunderbird account. Please help with this situation. My email account with Thunderbird is t****k@hughes.net

duplicate of /questions/1551815 thread

For about 2 weeks, EVERY time I try to write an email, after typing a few lines or so, the whole window 'grays out' and becomes UN-responsive. I get no error message. Waiting for it to respond doesn't work and I have to close out and re-start Thunderbird. Sometimes Thunderbird will have saved some portion of my email in my 'Drafts' folder, but not reliably, so I have to frequently 'Control + S' - save it to avoid having to re-type the entire message again. Troubleshoot Mode doesn't help, nor does clearing the cache. I've been hoping an update would come up that would solve this, either from Thunderbird or Windows (11), but not so far. Please tell me how I should resolve this - I have used Thunderbird for years (and regularly contribute too) and don't want to have to change to different email client.

Confused. Version 144.0.1 | Released October 16, 2025 Says 32 bit. I thought I downloaded 64 bit.

Problem: Freezes when I click anywhere on TBird desktop

How do I address the freezing problem?

Thanks Robert

Wife's computer died, but I saved the HDD. Got Tbird installed on the new one, retrieved and installed her addressbook on the new computer. Apparently she had a had a folder with saved messages on the old one. Where do I find this on the old harddrive? Recent version of Tbird on old computer, newest iteration on new computer. I have the original hard drive in hot swappable bay right now.

Long time Thunderbird user. My address is @verizon.net, which is controlled by AOL.This morning, although I am having no trouble with mail on my iPhone, when I try to send from my laptop I get the message, "The message could not be sent because the connection to Outgoing server (SMTP) smtp.verizon.net was lost in the middle of the transaction. Try again." Trying after a while is no different. Having no trouble with incoming messages on this device. Thoughts?

hi i have 2 pc's using tb , one can sign in to my outlook.com acct, but the desktop pc can not. have checked all setting etc

the working installation is on esr update channel, other on is not [so i have 2 difference tb versions]. both are updated

if anyone sees in a forum that i had email trouble recently pls note that i now have an old backup of win10 in service on the desktop pc. haven't yest found my way back to that forum to post the results of using peoples advice but they were very helpful

thanks if anyone can assist