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Thunderbird Portable

[Fixed] Thunderbird Portable 141.0 English installer is just 1.2 MB

Submitted by amitagarwal on July 25, 2025 - 12:25pm

It look like invalid file was uploaded for ThunderbirdPortable_141.0_English the file not have any exe
and giving error "Mozilla Thunderbird, Portable Edition cannot be started. You may wish to re-install to fix this issue. (ERROR: thunderbird.exe could not be found)"

Tools>Export

Submitted by noospam on June 4, 2025 - 5:39pm

Is Tools>Export meant to work for the portable version? I tried 3 times and zip files are successfully created. Howeverf I can't open the zip file because it says invalid.

I have the desktop version as well and that works fine.

Direct update (Help->About) not working anymore

Submitted by GoD on May 16, 2025 - 8:21am

Since TB 128+- I have a problem with updating TB.
Before I didn't always waited for PA to release the new version.
I clicked on Help -> About and installed the update. After a restart of TB, I had the newest version.
Now, I can update, restart TB and I'm still running the old version.
I can repeat this 10 times and nothing changes.
When I look in to the app folder, there is an update folder where the new version is inside.
When I close TB and move this folder so overwrite the existing app, I have the new version running.

Unable to start thunderbird after update today 2 May 2025

Submitted by noospam on May 1, 2025 - 5:46pm

Thunderbird portable have always been solid for me until this morning. I have always updated to newer versions when prompted and been good except this morning. The installation stalled and my laptop froze up. So I restarted my laptop and tried to run TB but I get these error messages. It did not load at all. Can't seemed to attach image here to show error messages. So error status is 0xc0000020 and "Couldn't load XPCOM".

Importing data into a Windows Thunderbird installation / Portable version as default mail program

Submitted by xprt007 on April 1, 2025 - 7:47am

Hi there
I have been using a portable version of Thunderbird, on partition D for a long time, but because I find no way of making it the default Windows mail program, a feature that I often need, I have installed a local version but having problems with importing the data from the portable version, because it is well over the 2GB, actually around 6GB, with many accounts, too cumbersome to setup anew, etc.
I see instructions for importing data into the portable version, but not the other way round.

Can't open attached files directly

Submitted by coffent on January 20, 2025 - 10:57am

When I try to open an attached file in an email message (say "Example.pdf") I get this error message, or something similar:

"An error occurred while opening a document from the file:
C:\Users\CHS2\AppData\Local\Temp\nsnD5B3.tmp\ContainedTemp\pid-20128\Example.pdf"

Based on ChatGPT, I tried adding a line like:

user_pref("browser.cache.disk.parent_directory", "D:\\cDat\\Programs\\TBird\\Temp");

but Thunderbird Portable overwrites the line if it's in prefs.js and ignores it if it's in user.js

[Bug] Task bar functions in WIN 10 (right-click) refer to an unconfigured account

Submitted by ASDEF on December 31, 2024 - 11:35am

Hi,

WIN 10, 64-bit, 128.5.2.esr, USB flash drive

2 tasks are offered:
“Write new message”
“Open address book”

The first opens a new message window for an unconfigured account.
The second opens an address book of an unconfigured account.

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