Please select the option most suitable for you: Premier Participant – This level of participation requires that you sign an Agreement with Microsoft, which in turn provides you with a dedicated, expandable workspace, allows you to add additional users via sub domain, enables you to post materials within Sandbox, and provides greater visibility t with Microsoft developers, designers and the like.
Standard participation – No Agreement, fast, enables you to take a look at what others have posted in Sandbox and familiarize yourself with the various Microsoft tools available there.