horigyuri

For the record: this was the solution. You should NOT associate Thunderbird with the Mapimail file in Sendto because it breaks the Send...

After removing and reinstalling Thunderbird, I also have this exact setting now. Thanks again.

Interestingly after several reinstalls, now the default setting worked in Thunderbird This option was always greyed for me, but after...

It's empty by me

I did that several times

Probably just changing the default email client to Thunderbird is not enough. Some extensions or protocols remain to Outlook or...

Thanks for the tip

Leave the mapimail think alone! Thunderbird is not capable of handling that In-built protocol. Reset your defaults again, choose MAILTO...

Thanks, I have the full desktop version.

OK, it seems TO ME those who said that it only works with Outlook were unfortunately right.

I never said that it does not work for anyone else. It works only with Outlook for me. And I never said Microsoft did this on purpose.

Yes, that's the question. I did not do anything special I upgraded from Windows 10 as soon as Windows 11 came out and at some point of...

OK, it seems those who said that it only works with Outlook were unfortunately right. If I reset apps to default, this send to Mail...

Big thanks to you for this tip, after resetting all apps now I see this: The only trouble is that it opens Microsoft Outlook, to...