Just wanted to get some opinions and thoughts about doing an upgrade as opposed to a wipe and clean install on some domain controllers. This will be a project during summer break for us and I know this upgrade isn't like going from 2003 to 2003 R2. I can go through the dcpromo process to demote and remove one at a time from my domain, then add them back with fresh installs (I would be using the same hardware), but if I don't have to, then that make life easier. I have just had quirky issues in the past upgrading from 2003 to 2008 which gives me pause. FYI, all of my existing 2008 are 64bit installs.