Unable to access old account (can it be merged)
1263
How can one link / merge / combine / associate two accounts / users? (Anonymous / unregistered / cookie, or Google / Facebook / registered)
79158
Is it possible to recover an account deleted at the SE team level?
88258
Can I recover a stack overflow account with a dead email address?
26134
How can I recover a lost account?
24377
Authentication with old password no longer supported, use 4.1 style passwords
60786
How to access a really old, untouched bank savings account?
150744
My Developer Account cannot be activated because I used a relative's credit card
134841
Locked out of Windows 10: login no longer shows Administrator, but only an account that I never used
111198
Can't log in due to Steam Guard and an inactive email account, what now?
45782
How can I log into a different Google account?
127724
Change Email and password + New Account
147088
If I change my avatar (or profile/user image) can I return to the old one?
107501
Will I keep my progress if I change account?
132308
How to fix insufficient access rights on cross-reference id?
81602
How to transfer installed apps from one account to another
61655
Can I transfer my content to another user account?
38617
How do I reclaim my Clash of Clans account?