How to convert an account from Yahoo to an OpenID?
3652
How do I change my login provider(s)?
113815
Change Windows 8 login from Live id to local account
84581
How to login in two accounts in the same browser?
35064
Is Stack Overflow merging two different accounts by email without the user's consent?
5404
How can I log into two different accounts on two different sites now (July 2015)?
24969
How to retrieve a stolen Yahoo account's password?
55093
How can I add a Stack Exchange login to my preexisting account?
73379
How can I link two Google accounts to one Stack Exchange account?
45782
How can I log into a different Google account?
35558
How can I change my nationality in my PayPal account without having to open a new one?
71580
Change default username from "Unknown" to "User{number}"
24294
How can I convert from a SID to an account name in C#
27216
How do I remove an OpenID or login?
90040
How to migrate local user to domain user?
72228
How to Query all opportunities ids from account
5946
Missed the MyOpenID demise; account lost forever?
51086
Is it possible to make signing up gracefully fail over to logging in if the SE OpenID account exists?