Google announced a change to its security policy to increase account security that includes the OAuth 2.0 token revocation upon password reset. The change to the Google security policy was announced last year by Google. The company will roll out the change starting on Oct. 5. Third-party mail applications that include at least one mail scope will no longer sync data when the user password is reset. Google decided not to move forward with this change for Apps customers and began working on a more admin-friendly approach.”]
Source: http://securityaffairs.co/wordpress/51555/breaking-news/google-oauth-2-0.html