title: How to update an Inbox message property
body: <p>Using Microsoft Graph Java SDK, I'd like to update an email property "isRead" to "True".</p>
  
  <p>Using the API (not SDK) documentation as reference: <a href="https://docs.microsoft.com/en-us/previous-versions/office/office-365-api/api/version-2.0/mail-rest-operations#update-messages" rel="nofollow noreferrer">https://docs.microsoft.com/en-us/previous-versions/office/office-365-api/api/version-2.0/mail-rest-operations#update-messages</a></p>
  
  <p>I haven't been able to find the corresponding Classes and methods to do it.
  I suspect the "singleValueExtendedProperties()" method to do the job, but I haven't been able to find any implementation or explanation on how to use it.</p>
  
  <p>According to the API documentation the SDK request should look alike:
  msGraphClient.me().messages(id).???</p>
  
  <p>I am not even sure this operation is supported by the SDK; has anyone already done it?</p>