Hi,
Yes you can reuse the exsisting CRM 4.0 solution with CRM 4.0 Web Service end points (Still avilable and have not removed for the backword compatibility but in the future version may be the support will be removed)
If you are planning to writing the solution for CRM 2011 later on then instead of writing the application from scratch you may preffer to upgrade your CRM 4.0 code as mentioned in the Upgrade Code Guide
http://msdn.microsoft.com/en-us/library/gg334220.aspx
You can access the CRM 4.0 Webservices in On-Premise and Online versions. In CRM 2011 deployment, you may access the service like:
http://crmserver:5555/OrgName/MSCrmServices/2007/CrmService.asmx
http://crmserver:5555/OrgName/MSCrmServices/2007/MetadataService.asmx
Jehanzeb Javeed
http://worldofdynamics.blogspot.com
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