What ISA scenarios you are using and can you please explain the IPC setup. Please tell me you are not using IPC. Otherwise you got to explain what did you possibly do with IPC component in the ISA 4.0 application configuration.
Other than IPC, there hasn't been much of a technical / architectural change in ISA in the context of a web container.
Since you have got the Webshop 4.0 work with CRM 5.0 and hence upgrade from CRM 5.0 to CRM 2007 is a technical upgrade (excluding the PCUI investments of course, I saw your other piece of question another forum ), your part (1) is technically feasible.
The development and deployment differs big time between ISA 4.0 and the newer versions - CRM 5.0 (er.. I meant ISA 5.0), 2007 or 7.0. Migrating the enhancements from ISA 4.0 to upper versions is fairly well documented if you get the NWDI and the NWDS part going correct. Other than the NWDI, the enhancement techniques of 5.0 are still valid in 2007. So, you are fairly covered as far as the custom development goes. This covers your second part of the upgrade.
See the upgrade guide for any specific issues. I haven't seen anything so far.
Easwar Ram
http://www.parxlns.com
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