After a several months long closed beta test, CloudMagic has released their Newton email client for Windows 10 via the Windows Store. Newton has some powerful email features, but costs US$50 per year and is competing against paid and free stalwarts such as Microsoft Outlook, Mozilla Thunderbird, and integrated OS clients.
https://www.notebookcheck.net/CloudMagic-s-beautiful-Newton-email-client-now-available-for-Windows-10.241908.0.html