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I have a problem with the 64-bit to 32-bit installation. (It created a duplicate for me), I uninstalled everything properly and reinstalled Today my computer does not recognize version 32 in default mode and I need it for my accounting software. We checked the registry keys, the settings ... everything is ok Thanks for your help.

Okay, I currently have two issues going on, both repercussions from transferring Thunderbird to my new computer. I'll limit this post to one issue!

My transfer to the new computer was not taking; followed instructions but no profiles were loading. I thought that perhaps this was due to my initial problematic installation of T-bird decades ago, where I eventually wound up with a choose-user-profile panel that worked fine with its default setting...so I lived with that easily (see image). Thinking that this was causing the inability to load profiles on the new machine, I tested whether I could delete the never-used profiles in that panel. After just one deletion, that resulted in the "Couldn't load XPCOM" error described here: https://support.mozilla.org/en-US/questions/1360766 Following the instructions on that page to do a repair installation (to the letter), starting T-bird now results in the attached "profile missing or inaccessible" message.

Please advise: Am I doomed?

Thanks for any honest advice. (yes, my Thunderbird installation is big: seven or eight addresses, many local folders, a large history and archives.)

I clicked the Thunderbird icon on my Firefox toolbar and the page that opened told me to complete my installation. I had believed my installation was completed quite a while ago, when I last clicked the icon. What must I do?

I'm trying to install Thunderbird on a Macbook - macOS Tahoe 26.2 I've made a donation but Thunderbird won't download.

I did not get any error messages, in fact nothing happened.

During the installation of Thunderbird I have received the following message:

"The follwing settings were found at your email provider:

mail.your-server.de“

This is NOT my current email provider!!

What does this mean??

I am trying to re-install Thunderbird on my wife's old Gateway desktop. I downloaded version 115.18.0 and tried to install it, but get a message saying it can't be installed because my OS is 32 bit. I thought the SuperNova would work for both 64 and 32 bit OS platforms. (It does work on my Toshiba laptop, which is a 64 bit Win 7 machine.) If this version of Thunderbird will not work, what about the last version that will. It was installed years ago. Thanks, Peter

Just after installation, and before going any further like adding the email account, ; google: Error 400 "the server cannot process the request because it is malformed. It should not be retried. That's all we know"

Followed unstall and trying to remove remaining folders, data from computer.

I cannot del these folders, etc despite being admin mode or from command line.

whats next.

I want to do a fresh install of Firefox but wont install firefox again if I have to an computer reimage.