I have been facing the following strange behaviour on Microsoft Account password (there is also other closely same case posts in here):
- the Microsoft Account is based on a Gmail Account, with a different password
- the password was changed on Skype, and now well working for it and also for Microsoft Account general login
- the old password is despite now still valid for Windows 10 Microsoft Account login
Seems quite strange, and even frightening, if there may arise some contradiction or mess with/between those two different passwords for this critical Microsoft Account ...
What to do now, or maybe what not to do, anyway to be safe in future?