Our Sitecore 8.1 application production server is hosted in Windows 2008 R2 OS environment. We are planning to raise the Domain Functional Level of Active Directory Domain services from Windows 2003 to Windows 2008. How to make sure that this does not affect any our application's functionality.
Is there any way to know if our application (It is a large application built long back and none of us know it end to end) is anywhere using active directory domain services? Please help us here.
Or Does this DFL raise from Windows 2003 to Windows 2008 have any effect at all?