CRM 4.0 Route and Handle Message not getting triggered in CRM 2011 Environment

HI All

We have migrated some plugins which is written in CRM 4.0 in to CRM 2011 Environment by Using CRM 4.0 Plugin registration tool which is pointed to 2007 web Services. Whereas “Handle” & “Route” messages not getting triggered in CRM 2011 environment even though it says that will be supported with 2007 Services.

Please kindly help us on this regards. (Our next step would be converting the plugin to CRM 2011 and handle with new Messages whereas we need a quick fix for the time being.