As of April 12th, you must go to Progress SupportLink to create new support cases or to access existing cases. Please, bookmark the SupportLink URL and use the new portal to contact the support team.
Mark Thien
http://devcenter.kinvey.com/html5/guides/users#userexists
is there a function for Email Existence Check ?
username and email should be automatically check for User collection when signup since these 2 field cannot be duplicated.