IIS7 requires the following in the web.config:

<system.webServer>
  <validation validateIntegratedModeConfiguration="false"/>
  <modules>
   <add name="Spring" type="Spring.Context.Support.WebSupportModule, Spring.Web"/>
     </modules>
  <handlers>
   <add name="SpringPageHandler" verb="*" path="*.aspx" type="Spring.Web.Support.PageHandlerFactory, Spring.Web"/>
   <add name="SpringContextMonitor" verb="*" path="ContextMonitor.ashx" type="Spring.Web.Support.ContextMonitor, Spring.Web"/>
                                  <!--Not using Spring web service support-->
   <!--<add name="SpringWebServiceSupport" verb="*" path="*.asmx" type="Spring.Web.Services.WebServiceHandlerFactory, Spring.Web"/>-->
   
  </handlers>
 </system.webServer>