I know I know I know windows 8.1 is developer and us at your own risk. I am a Developer. So here my problem I upgraded to 8.1 but it lock my Microsoft account to my Yahoo account. So using Cortona or many apps keeps asking me for my windows password, but I cant change the email from my yahoo and Microsoft dosnt know that password. I have many Microsoft accounts, MSDN, Azure, 365, Xbox Live and I sure I had a Hotmail years ago. Went to Microsoft store and they were no help, used my msdn tech support no help......... All telling me to back up phone and reset. Not the end of the world but being a developer I like to look for solutions... So I have a live account and I log in and I figure if I just create a alias with my yahoo address all will be good and I still think this. But live will not let me create a alias cause I have used it in another MS account. I sure I have I have been MS for 10 years. So has anyone had this problem or is there a way to figure out where I used that yahoo email address in Microsoft. And Microsoft offer no help.... Thank you to anyone that can help..... error code 80860006 is what I get