To update the email that is attached to your Microsoft Account,
- Log into: https://account.microsoft.com/
- Click on 'Your info' in the top menu
- Select 'Manage how you sign into Microsoft'
- Verify your account if asked
- Select 'Add email' and add your updated email address
- Under 'Sign In Preferences' choose 'Change Sign In Preferences'
- Either select the check boxes next to the aliases you want to use to sign in, or clear the check boxes for the aliases that you don’t want to use to sign in, and then select 'Save'.
For more information about updating your email address in your Microsoft Account, click here.
If you're unable to sign-in because of missing password or user name information, refer to this article for steps on how to recover your account: I don't remember my password or user name.