title: Restricting form-based authentication in Office apps
body: <p>In regards to the following message in Office 365 (and Office apps):</p>
  
  <blockquote>
    <p>To help provide additional security coverage, we are changing how
    form-based authentication in Office applications is handled.
    Forms-based authentication is a legacy authentication method for
    Office resources that are not protected by Azure Active Directory
    (AAD) or Microsoft account (MSA).</p>
  </blockquote>
  
  <p>What does this mean for developers of Office apps? Does this mean we will no longer be allowed to use form based sign-in (such as email/password)? And if so, does this mean we have to switch to an OAuth based login/registration system?</p>