Member Avatar for Techno22

I need to urgently access Thunderbird mail on XP Machine
but can't.
Getting the following message:
Entry Point Not Found.
The procedure entry point
JS FlagSystemObject
could not be located in the dynamic link library js3250.dll
Does anyone understand this?
If so can you please help me access my email.
Thanks.

ps This seemed to happen while Thunderbird was updating.
Also, I use Spamhilitor with Thunderbird.

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  • Latest Post Latest Post by crunchie

Dani AI

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This error means Thunderbird tried to call a SpiderMonkey (Mozilla JavaScript) function that the js DLL it actually loaded didn’t export — in other words, the executable and the js3250.dll on disk are out of sync (a version/filename mismatch or replacement). The symbol JS_FlagSystemObject is part of SpiderMonkey’s API, so a wrong or leftover js*.dll will produce the “Entry Point Not Found” dialog instead of a clean update/startup. (bugzilla.mozilla.org)

Typical causes are a failed/partial update (security software locked a file), an older js DLL left behind, or another application bundling a different SpiderMonkey DLL. That’s why the usual repair is a clean reinstall of the application files while keeping the profile (your mail data) intact — the reinstall replaces the program DLLs but preserves your messages. (support.mozilla.org)

Practical, safe steps (keep data first):

  1. Close Thunderbird and back up your profile folder (Windows XP: copy %AppData%\Thunderbird\Profiles\ to an external drive).
  2. Download a fresh Thunderbird installer from the official site and save it.
  3. Remove or rename the Thunderbird program folder (so the installer replaces all program files), then run the downloaded installer.
    Do not delete your profile unless you intend to lose local data. These backup and reinstall steps are the standard recommendation. (support.mozilla.org)

If reinstalling doesn’t help: check for duplicate/wrong js*.dll files and see which DLL Thunderbird actually loads. Use Process Explorer to view the process’s loaded modules or Dependency Walker to trace DLL imports; that will show whether a non-Thunderbird folder is supplying js3250.dll. If you find unexpected copies, scan the system (or use offline rescue media) and remove the rogue file rather than downloading DLLs from random sites. (documentation.help)

Good that posted the outcome; what you saw is a well-known mismatch and the clean-reinstall approach reported there is consistent with the documented fixes. Thanks also to for the follow-up.

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Member Avatar for Techno22

Finally got it sorted.
Re installed Thunderbird.
All files and messages came back with new version.

Member Avatar for crunchie

Thanks for posting back with the fix :)

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