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You need an additional layer of security called multi-factor authentication. Your organization can’t afford to make passwords the only barrier protecting your business files and email from outside attackers. A bad guy who acquires your username and password can use those credentials to impersonate you at the associated service, with potentially disastrous results. The problem with passwords is that they are too easily stolen, guessed, or phished. Some secrets are too important to be protected only by a password. Ed Bott explains how to use your smartphone to ensure that only you can get access. If you're serious about security, you can't afford to protect your business files and emails with just a password. Setting up two-factor authentication on Office 365