I read this news from the excellent blog
I recommend reading the article by clicking the link below
Whilst reading the article I looked at the What’s changing in the next major release and there are some quite fundamental changes, especially if you have used legacy CRM 4 code and haven’t properly updated it yet.
This link from MSDN has the changes in detail
here are the highlights
The following legacy Microsoft Dynamics CRM 4.0 features will be removed or will no longer be supported in the next major product release:
- ISV folder support for custom web applications
- Microsoft Dynamics CRM 4.0 plug-ins
- Microsoft Dynamics CRM 4.0 client-side scripting
- Microsoft Dynamics CRM 4.0 custom workflow activities
There is also the removal of some Ribbon controls.
so there are certainly some things to keep in mind