Microsoft today announced that they have enabled optional two-step verification for Microsoft accounts.
With this release you can choose to protect your entire account with two-step verification, regardless of what service (or device) you are using with your Microsoft account. It’s your choice whether you want to enable this, but for those of you that are looking for ways to add additional security to your account, we’ve worked hard to make set-up really easy.
We’ll verify that you have at least two pieces of security information on file (it’s always good to have a second in case you lose the first). If you have a smartphone, we’ll help you set up an authenticator app, which allows you to receive two-step verification codes even while offline (very useful on vacation and to avoid messaging fees). The next time you sign on, you’ll be prompted for a code.
To get started, go to https://account.live.com/proofs/Manage.