Hi, icloudemailwindows, and thanks for reaching out. We see that you're having issues using iCloud Mail on your Windows device. We'll be glad to provide some information.
Here are the features you can access using iCloud for Windows: What is iCloud for Windows? It does state,
"Mail, Contacts, and Calendar
Access your iCloud Mail, Contacts, and Calendar in Microsoft Outlook. When you make a change on your Windows computer, your information is updated everywhere. Learn how to set up iCloud Mail, Contacts, and Calendar."
To confirm, are you using Microsoft Outlook to access your email, and did you follow the steps here: Set up iCloud Mail, Contacts, and Calendar in Outlook on your Windows computer
If you canât add iCloud Calendars, Mail, or Contacts to Outlook may offer even more assistance. Check out the Mail section there.
We hope that helps out.
Cheers!