http://msmvps.com/blogs/luisabreu/archive/2007/01/24/datasource-control-more-breaking-changes.aspxIn previous versions of the AJAX extensions platform, you could use this control to call remote services exposed by a handler or a data service. The only restriction is that the server component needs to return data in JSON format because that's the onlyenCommunityServer 2008.5 SP2 (Build: 40407.4157)