i have a win2k domain controller, hosting exchange 2000 and when I try to load up active directory users and computer.. my exchange tabs are missing.. any idea how i can get em back? This has happened because a raid drive has failed and corrupted files. Can I re-install exchange? Will it repair it without any adverse effects? Should I install SP2? Will it be able to fix the corrupted files? Also I have will have to rebuild this server at some point because I don't know what system files are corrupt.. how can I bring another exchange server online and migrate everything over? Thanks, Mike