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Set as email default option shows each time I open Thunderbird

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Whenever I open Thunderbird, running Windows 10, it asks me if I want to set Thundebird as my default for email. I've checked that TB is set as my default mail client and it is, yet I still get this system integration message every time. Any help would be appreciated but please keep it as simple as possible.

Whenever I open Thunderbird, running Windows 10, it asks me if I want to set Thundebird as my default for email. I've checked that TB is set as my default mail client and it is, yet I still get this system integration message every time. Any help would be appreciated but please keep it as simple as possible.

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Are you running any other email clients? MS Outlook, in my experience, always assumes that it will be my default email client and without asking, sets itself. Then I run Thunderbird and it finds that it isn't the default and politely asks me what to do about it.

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No, I removed the others and made sure that TB was set as the default (it still is showing as the default)