The Bing Ads API Version 7 is scheduled to sunset as early as the first week of April 2013. You must migrate your application to version 8 before the sunset date. Failing to go through migration will cause your application to stop working when the services are removed. For information about what?s changed from version 7 to version 8, see Migrating from Bing Ads API Version 7 to Version 8. To test your migrated application, use the Bing Ads API sandbox. For more information about using the sandbox, see Sandbox. Please reach out to support and forums if you have any questions or concerns.