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Microsoft adding multi-factor authentication to accounts
Microsoft Account Gets More Secure
Over the next couple days we will roll out a major upgrade to Microsoft account, including optional two-step verification to help keep your account more secure.
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Given this critical role for Microsoft account, we remain vigilant in working hard to protect your account, which is why we're adding an option so you can enable two-step verification to further protect yourself. You should see this option show up in your account in the next few days. You can enable this capability at https://account.live.com/proofs/Manage.