I have a CM Publisher and Subscriber both runnig 3.1.3a(spD), Unity server (NT 4.0 sp6a) running Unity 220.127.116.11, TSP 3.0.4, Exchange 5.5 (sp3). I am ready to upgrade my PDC to W2K and AD. Following that, I would like to upgrade my Unity server (that also doubles as my internal exchange server) to W2K and Exchange2000, and subsequently Unity 3.1.x. I have seen on answermonkey.net that there is a DB export/import tool for that migrartion. The question is, what else do I have to worrie about? What pitfalls has anyone run into, and are there any suggested readings before embarking on that path? Any help is appreciated.