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I never asked for it, but Thunderbird is trying to install. I do not want it. It refuses to cancel. I can't use my computer until it does

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Thunderbird invited itself to install on my computer without my permission. I cannot cancel it. It ignores my request. I can't open anything else until it leaves. Please help.

Thunderbird invited itself to install on my computer without my permission. I cannot cancel it. It ignores my request. I can't open anything else until it leaves. Please help.

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Hi, This seems strange. Could you please elaborate more on how "Thunderbird invited itself to install on my computer without my permission".

One case that I can see is if you are part of company that uses Thunderbird and the administrator pushes the program to your computer because of some internal procedures, but this is rear.