+ 0 Votes well.. TheVirtualOne 6 years ago security and scalability 'eh... The first thing that comes to mind is that you should change the schema before you try to do anything with the AD. Then start looking at IPv6 and the impact that it will have IF you were to choose it when you were building the new schema. It will happen. The only question is when. My first concern with IPv6 are the networked devices. Everything other than a computer that has an IP address. That will be expensive part of the upgrade process. Copiers, Printers, Manufacturing devices, Time and Attendance Machines... all of those things will be difficult and expensive.