Bing said Tuesday that it will retire on March 30 the Maps Token Service, and urges those using the tool to upgrade to Bing Maps Keys. The upgrade applies to Bing Maps AJAX Control v6.3, SOAP Services, and Silverlight Control. Microsoft tells us the upgrade will provide better performance management and reporting. Also, Bing Maps Keys do not expire. For those who are not sure whether their Bing Maps application calls or references a Bing Maps Platform, Microsoft provides a list of URLs that help to identify use.