Forgot the outlook mail adress - locked out of C-drive

1. Recover Microsoft account: 
Visit Microsoft account recovery page 
Select "I forgot my password" 
Verify your identity by alternate email/mobile phone number 
Unlock local account (administrator privilege is required): 
2. Log in with other administrator account 
Go to "Settings > Accounts > Family and Other Users" 
Reset password of the target account 
3. Recover access to the C Disk 
Temporarily obtain privileges: 
Right-click C Disk > Properties > Security Click "Advanced" > Change Owner Create new account to transfer data: Settings > Accounts > Add New Local Account Copy data with the new account after logging in. Properties > Security 
Click "Advanced" > Change Owner 
Enter the current user name > check "Replace subcontainer permissions" 
4. Create a new account to transfer data: 
Settings > Accounts > Add new local account 
Copy important files after logging in with the new account 
5. Preventive Measures 
 Bind at least two authentication methods (cell phone + alternate email address) 
Regularly back up the BitLocker Recovery Key Enable the System Restore point