New to the forum and I believe that I posted a question regarding the use of an Alia live account as well as the Microsoft account on my Lumia 1520. I had done it on my Lumia 925 and could not remember how. I finally did figure it out today. You simply set your Alias up as an exchange account. Uncheck the mail sync box in the main Microsoft account settings to keep from doubling up on the inbox. In the alias account settings check the boxes to sync all. I go into the calendar settings as well to keep from doubling up those as well, and there you have it!