OS Upgrade from os 2003 to os 2012 impact on applications on the server

Hi All,

We are going to have a client server os upgrade from 2003 to 2012. We have applications like SQL Server Management Studio, SQL Server Integration Services, SQL Server Analysis services and SQL Server Reporting Services. Apart from these, we are using Sharepoint 2007 and .Net for some functionalities.

The new server would be built in parallel with the current one and the current one will be decommissioned soon. 

I want to know the

• software that need to be installed on the new server
• The testing that will be involved in this upgrade
• the risks involved in this upgrade

Please help!!

Thanks!