If you must use the original software for legacy reasons, you can find the installer on archival sites.
The app was a staple email client for Windows 7 and 8, known for its unified inbox and offline access. However, Microsoft officially ended support for the Windows Essentials 2012 suite (which includes Mail) on January 10, 2017 .
: The app is technically compatible with Windows 7, Windows 8, Windows 10, and even Windows 11.
: During setup, choose "Select the programs you want to install" and check only Mail to avoid unnecessary legacy apps like Messenger.
: You can download the full offline installer from the Internet Archive (Archive.org).