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Can't add importEportToolsNG - not compatible with Thunderbird 91.0.1

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I want to open an .MBOX file, and found out that Thunderbird was recommended. I downloaded it (Windows 64-bit) and then found this support page (https://support.mozilla.org/en-US/questions/1285736) which explained that I needed importEportToolsNG.

However, when I tried to load the importEportToolsNG add-on, I got the message "importEportToolsNG could not be installed because it is not compatible with Thunderbird 91.0.1" (see attached file).

BTW, the same thing happened when I downloaded importEportToolsNG directly and then tried to add it in Thunderbird from a file. There is no reason why this should work, but I tried out of desperation.

Help! What can I do?

I have a Lenovo ThinkPad X1 Carbon Gen 8, running Windows 10 Pro

I want to open an .MBOX file, and found out that Thunderbird was recommended. I downloaded it (Windows 64-bit) and then found this support page (https://support.mozilla.org/en-US/questions/1285736) which explained that I needed importEportToolsNG. However, when I tried to load the importEportToolsNG add-on, I got the message "importEportToolsNG could not be installed because it is not compatible with Thunderbird 91.0.1" (see attached file). BTW, the same thing happened when I downloaded importEportToolsNG directly and then tried to add it in Thunderbird from a file. There is no reason why this should work, but I tried out of desperation. Help! What can I do? I have a Lenovo ThinkPad X1 Carbon Gen 8, running Windows 10 Pro
Ama-screenshot ananyekiwe

Isisombululo esikhethiwe

Remove the .mbox extension from the file, then Help/More Troubleshooting, Profile Folder, Open Folder, close TB, copy the file into Mail/Local Folders, restart TB, see the folder under Local Folders in the Folder Pane.

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Isisombululo Esikhethiwe

Remove the .mbox extension from the file, then Help/More Troubleshooting, Profile Folder, Open Folder, close TB, copy the file into Mail/Local Folders, restart TB, see the folder under Local Folders in the Folder Pane.