136 is upward compatible. You can install 136 over the top of 128 or you can uninstall 128 first. Be sure you want to do that, as some addons may not yet be compatible.

Hi David 136 has installed along side 128.

Please check location of thunderbird.exe. Do both versions execute? Did you accidentally install the beta?

Hi David,

I had version 128.8.8.0ESR which stopped receiving messages after downloading 48k message, So I wanted to update to version 136 hoping to solve the issue. But now I have both versions installed. Once ll of the messages are downloaded, I will remove/uninstall version 128.8.oesr.

Thanks

William

I encourage you to carefully verify this. Do check c:\program files to see if there, in fact, two copies of thunderbird.exe installed. Just yesterday, a user 'thought' he had two versions and, when he uninstalled one, he found that he had lost both. are there icons on the desktop for each? If so, rightclick and check properties. if they're the same, you do not have two copies. Let me know.

Hi David,

Here is what I see:

128 Version 128.8.0esr Build ID 20250304221304

User Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Thunderbird/128.8.0

Application Binary C:\Program Files\WindowsApps\MozillaThunderbird.MZLA_128.8.0.0_x64__h5892qc0xkpca\VFS\ProgramFiles\MZLA Package Root\thunderbird.exe

136 Version 136.0.1 Build ID 20250317195841

User Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:136.0) Gecko/20100101 Thunderbird/136.0.1

Application Binary C:\Program Files\Mozilla Thunderbird\thunderbird.exe

Thanks, my inference is this was downloaded from Microsoft, which is a very different animal and one I never recommend. Yes, remove 128 when possible, as support for Microsoft versions is sketchy.

Hi David,

Version 128 was downloaded from the Thunderbird site: Thank you and others again for all of your help. I will close the inquiry:

Thunderbird Desktop Version 128.8.0esr | Released March 5, 2025 Check out the notes below for this version of Thunderbird. As always, you’re encouraged to tell us what you think, ask for help, or file a bug in Bugzilla.

For help and a quick start on Thunderbird 128, see Thunderbird 128 Nebula FAQ

For more on all the new features in Thunderbird 128, see What’s New in Thunderbird 128.

System Requirements: Details

Windows: Windows 10 or later Mac: macOS 10.15 or later Linux: GTK+ 3.14 or higher

re: Version 128 was downloaded from the Thunderbird site.

The info you posted says very clearly : Application Binary C:\Program Files\WindowsApps\MozillaThunderbird.MZLA_128.8.0.0_x64__h5892qc0xkpca\VFS\ProgramFiles\MZLA Package Root\thunderbird.exe

That version of Thunderbird came from the Windows App Store. Only Windows OS will install Thunderbird into that location by default and only if Thunderbird was selected to install from the Windows App Store.