As the years go by, email stands strong
Windows Live Mail is a free mail app available from Microsoft as part of the Windows Essentials 2012 suite. It's less of a juggernaut than Microsoft's own Outlook yet different from the Mail app bundled with Windows 8.1 or 10. Its interface is very similar to Microsoft's other apps of the time, such as Office 2010. It's suited for both home and small office users, and includes a calendar and conversation view, as well.