Conventional IT wisdom says you should roll out complex network changes in stages. But which stage comes first? That question comes from a TechRepublic member who’s about to launch a major Windows 2000 deployment. “We have gone through the servers in question with the Compatibility Analyzer,” he writes, “and have identified various drivers and applications that need updating. But now what? We’re upgrading a PDC, BDC, Exchange Server, and a server for a browser-based proprietary application thatties pretty tightly to IIS4. The Compatibility Analyzer recommends we upgrade the PDC first. Should we down all workstations and secondary servers before performing the upgrade? Or should we down the BDC & Exchange Server before upgrading the PDC? Also, how concerned should we be about major differences with the new version of IIS?” If you can help sort out this upgrade puzzle, you could earn a fistful of TechPoints. As always, the best responses will appear in my next Microsoft Challenge column.