Installing new versions of deprecated Windows services
Only if you intend to keep using the classic ASP API or the 5.3 ASP.NET API, copy and install the deprecated Windows services for the Broker, Linking and the WAI.
Content Delivery .NET upgrade impact overview
Upgrading the .NET HTTP Upload Server Role
Upgrading the .NET API Server Role
Upgrading the .NET Content Delivery Web service Server Role
Upgrading the .NET session preview Web service Server Role
Upgrading the .NET session preview Web site extension Server Role