Thank you for replying with the status of the issue.
As I mentioned in my previous post If you are using Microsoft account to sign in to the computer and when you access any Microsoft websites such as outlook.com, msn.com even the Bing.com (search engine) it automatically uses the same credentials of signing
in to the computer to any Microsoft website you visit.
This feature is by design which can not be disabled as Microsoft has made it integrated with Microsoft’s services such as login to Windows store automatically by one click and so as to the other live application on windows 8 and Windows 8.1.
Although, logging in with Microsoft Account is not mandatory in Windows 8, but it does provides various features and beauty of Windows 8 for users.
You can always use a local account to sign-in to your Windows 8 computer system – as you did in Windows 7 and the earlier versions of Windows. But, if you sign-in with your Microsoft account you can actually enjoy the impressive features of Windows 8.