First, you need to install Microsoft Remote Desktop. To do this step you need an Apple ID.
The application is free so it does not need any payment.
It is available by searching “Microsoft Remote Desktop” on App Store or you can open the direct link from Mac Self-Service.
To access the Mac Self-Service you can find more information on the following link:
Open the page https://remotedesktop.web.cern.ch/remotedesktop/RDGateway/SetRemoteAccessAccounts.aspx and select your Windows computer name.
Add your login as a new member.
You can download the RDP file using the “Download RDP file” proposed.
Simply open the RDP file you just downloaded. Or you can use the file you received by mail from Remote Desktop Service. Type in your login (using cern\yourLogin format) and your password.