If you no longer want to use Microsoft Account to login to the computer, you will find below the steps to change or switch Microsoft Account to a Local User Account in Windows 10.
Change Microsoft Account to Local Account in Windows 10
Windows 10 prompts users to provide Email Address and create Password, when they start setting up New computer, install Windows 10 on an existing computer or try to create a New User Account.
Once an Email Address and password is provided, Windows 10 automatically creates a Microsoft User Account on your computer, which can be logged in using Email Address and Password.
Another unwanted way that users end up converting their Local User Account to Microsoft Account is when they login to Windows Store for the first time by providing an Email Address.
If you feel like you have been tricked into creating Microsoft User Account, you can simply delete the User Account from your computer (if it has no files).
If you have been using Microsoft User Account for quite some time and it has files, it is better to switch or convert your existing Microsoft Account to Local User Account.
Switch Microsoft Account to Local User Account
Go to Settings > Accounts > select Your Info in the left-pane. In the right-pane, click on Sign-in with a local account instead link.
When prompted, enter your current Microsoft Account Password and click on Next.
On ‘Switch to Local Account’ screen, type User Name, Password and click on Next.
On the next screen, click on Sign Out and finish button.
After this, your computer will no longer be associated with Microsoft Account and you will be able to login to the computer using the New Local User Account and Password that you just created.
What Happens When You Switch Microsoft Account to Local Account?
When you switch an existing Microsoft User Account to Local User Account, Windows 10 totally removes the Microsoft Account from your PC and allows you to Login using your New Local User Account.
All your Files, Photos and other Data will be accessible and only Apps linked to Microsoft Account will require you to sign-in using your Microsoft Account.
Although, Microsoft Account is removed from the PC, it continues to remain active or valid and you will be able to use the Microsoft Account to Sign-in to Microsoft Services like Skype, Microsoft Teams and others.