Good Day MariBuchholz,
My name is Carlo, I am also using Windows user and community member like you.
That is definitely a scam, it a phishing email, Windows Defender is free it is a built in anti-virus in your computer, ignore it , don't provide any personal information of any especially credit card details.
To know more about Phishing emails visit this link.
https://support.microsoft.com/en-us/windows/pro...
I hope the information above helps.
Have a wonderful day ahead and stay safe.
Sincerely,
Carlo T.