re:
Yes I downloaded it onto my 1520. It has been a continuous rat's nest of trouble and problems (live tile not working, "unknown error occurred" messages when trying to set up basic settings, etc.). I've written to the developer with details and am waiting for his response/advice. I read some other comments in which developer was saying it's a Windows 8.1 OS problem. For now, I would recommend you stay with the default email client until MetroMail is properly fixed, updated and maintained!!