title: Programmatically read/write Excel Web App on Office 365
body: <p>I'd like to read and write cells on an Excel Web App hosted at Office 365.  There seems to be conflicting information online whether API access to EWA is even possible.  </p>
  
  <p>I would expect to use some of the RESTful APIs, such as the following:</p>
  
  <p><strong>https://[myoffice365site]/personal/[myusername]/Documents/[myworkbook].xlsx/model</strong></p>
  
  <p>But when I do, I receive a generic 404 error.  I've also been unable to find any tokens or API keys in my Office 365 account.</p>
  
  <p>Has anyone had any luck accessing an Excel Web App using C# or Javascript?</p>
  
  <p>Thank you!</p>