Business Package Question

All,

We are about to install SAP CRM 2007 business package and I just wanted to check if anyone knows whether it is backword compatible or not.

My other question is let assume we installed this business package to our portal (EP 7.0) but our CRM system is 4.0. Would integration still work? For instance would it impact CRM (4.0) transaction iviews?

I appreciate any help.

Regards.