Change Primary Email

Login to your account and select “Your info” (Image 1) , next step – go to “Manage how to sign in to Microsoft

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Select “Add email” (Image 2)

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Then add new email and select “Make primary”(Image 3), remove old email.

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Now ONLY YOU know your new email address!

There is other thing that helps you

Login to account and select “Security & Privacy”(Image 4), next – “More security settings”, search these 2 functions: Two-step verification and Recovery code”.