Windows 10 bereikte EO (einde ondersteuning) op 14 oktober 2025. Lees voor meer informatie dit artikel.

Windows 10 reached EOS (end of support) on October 14, 2025. For more information, see this article.

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After moving old profile to new machine, thunderbird states that it cannot use the profile because it is in use and to close thunderbird, but it is closed.

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  • Laatste antwoord van pgensinger

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I am moving Thunderbird to a new machine and want to move the old profile. After installing Thunderbird, I copied the profile and using the "thunderbird.exe -p" command added the old profile. When I start Thunderbird, I get the following error message; "Thunderbird cannot use the profile "profile name" because it is in use. To continue, close instances of Thunderbird or chose a different profile" But Thunderbird is not running and I cannot get this to work. Please help!

I am moving Thunderbird to a new machine and want to move the old profile. After installing Thunderbird, I copied the profile and using the "thunderbird.exe -p" command added the old profile. When I start Thunderbird, I get the following error message; "Thunderbird cannot use the profile "profile name" because it is in use. To continue, close instances of Thunderbird or chose a different profile" But Thunderbird is not running and I cannot get this to work. Please help!

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Assuming you use a Windows OS when creating the backup. Access profile name folder. In the same folder where you can see 'Mail' folder. Scroll down. Locate and Delete the following file.

  • 'parent.lock'

Then try to start Thunderbird.

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Toad-Hall,

Thanks for your reply; it turned out to be a corrupt "profile" file. I restored an older one and it worked with a few missing emails. Good thing I backed up the older computer first.