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https://account.microsoft.com/account

Just sign in and go. Access your favorite Microsoft products and services with just one login. From Office and Windows to Xbox and Skype, one username and password connects you to the files, photos, people, and content you care about most.

https://support.microsoft.com/en-us/help/12412

When you're sure you're ready: Go to Close your account.; When you're prompted to sign in to your account, double-check that it's the account you want to delete. If not, select Sign in with a different Microsoft account.If you're having trouble signing in to the account you want to close, see When you can't sign in to your Microsoft account for help fixing the problem.

https://support.microsoft.com/en-us/help/4511051/microsoft-account-activity-

Published: July 01, 2019 Effective: August 30, 2019 This Microsoft account activity policy describes when Microsoft may close your account due to account inactivity. You may choose to close your Microsoft account at any time on the Microsoft account management website and Microsoft may close your account for other reasons as permitted under the Microsoft Services Agreement (“MSA”).

https://answers.microsoft.com/.../what-is-the-msa-id/6434d904-2068-479f-ba35-4491d972421c

MSA ID is Microsoft Account Identity. Are you facing any issues with Microsoft Account or with Windows 10? Let us know what are the issues you are facing. We will be glad to assist you. Thank you. 5 people were helped by this reply ...

https://docs.microsoft.com/en-us/azure/active-directory-b2c/identity-provider...

Enter a Description for the secret, for example MSA Application Client Secret, and then click Add. Record the application password shown in the Value column. You use this value in the next section. Configuring optional claims