Based on the number of "my password doesn't work" and "Outlook won't log in" questions I see, a lot of users forgot they need to use the app password. This works great, as long as you remember that you need to use the app password when setting up email accounts. If you need to revoke app passwords at, all passwords are revoked. You can use one app password on all devices or create one for each device. One password can be used with multiple devices, so copy the password and keep it in a safe place. Email clients can't display the second authorization screen so you need to use a special "app password" instead of your normal password, which you created when you set up two-factor auth. When you log into an account online, you're presented with a screen that asks you to enter the code you received by text message. If you're fooled by a phisher and use two factor auth, the bad guys can't get into your account without this code, unless they also have your phone. This code is sent by text message (or email) and is only valid for a short period, usually 20 minutes.
How it works: when you log into your account from a device, you need to use a special code or password to access a site. Facebook, Gmail, GoDaddy, Twitter, and are among the growing number of sites that use two factor authentication. Two-factor (or two-step) authentication is used by many sites and services to protect your accounts from hackers. I thought I wrote about this a few weeks ago, right after Microsoft introduced two-step authentication at but I can't find it, so if it's a duplicate, sorry.
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