just installed and am testing a trial version of data rewinder for our exchange server which apparently works for both unix and windows, but we're running it on 2000 advanced server. so far, so good. its not a replacement for back up software, but for those looking for quick recovery from mailbox corruption, i recommend taking a look. what's really great is i was able to install it w/o restarting the exchange server, so it went totally undetected by my users. will post again after i've completed testing. looking for more interesting features.