Each time I start Thunderbird, the question pops up: use Thunderbird as the default client .... and I says yes.
What is more, at Default Programs, Thunderbird has all rights.
But still it doesn't work.
I use Windows 7, Thunderbird 60.0
If I click on a link to send a mail, Internet Explorer pop up with : "Could not perform this operation because the default mail client is not properly installed"
What should I do?