To assist you in this effort, Microsoft has created a tool to help identifying and correcting unsupported code prior to upgrade. You can download, install, and run the tools explained below on your Microsoft Dynamics CRM 2011 organization to confirm.
Microsoft Dynamics CRM 2013 Custom Code Validation Tool - The custom code validation tool will examine web resources and shows where there might be some problems. The issues that are flagged are either using unsupported coding processes or using the CRM 4.0 objects and functions. You can download this tool and extract the contents. Within the contents you will find instructions about how to install and use the tool.
Reference Link
Legacy Feature Check Tool - The legacy feature check tool detects and reports on server extensions in your organization that use the 2007 endpoint and legacy Microsoft Dynamics CRM 4.0 features. These checks are also performed when you upgrade your server.
Reference Link
Microsoft Dynamics CRM 2013 Custom Code Validation Tool - The custom code validation tool will examine web resources and shows where there might be some problems. The issues that are flagged are either using unsupported coding processes or using the CRM 4.0 objects and functions. You can download this tool and extract the contents. Within the contents you will find instructions about how to install and use the tool.
Reference Link
Legacy Feature Check Tool - The legacy feature check tool detects and reports on server extensions in your organization that use the 2007 endpoint and legacy Microsoft Dynamics CRM 4.0 features. These checks are also performed when you upgrade your server.
Reference Link
