Our organisation have an AD on Win2000 and intend to upgrade to 2008. However, we also have quite a few legacy apps and servers and to replicate the environment in lab manager for testing is a huge undertaking. Is there a way we can have both ADs running and then test the AD2008 in the prod environment without affecting other users? The idea would be to slowly migrate users across and fixing issues as they arise. Some apps do need the AD, what is the best approach for this migration from 2000 to 2008 AD ? Thanks in advance..