Yesterday, our firewall was breached, the a trojan virus was placed on an internal server, and basically ground the network to a halt. In the 18 hour day and night long process, our win2k OS hosting the exchange app took a header. It's a single site, single 5.5, on a win2k server in a NT4 domain. C:\ contained the programs, d:\ contained the public info store, & e:\contained the private store. When I rebuild the OS and reinstall exchange, when I specify the where I want the DB's to end up (in the same locale), will it find the existing public and private db's and overwrite them?? Or will it find them, see that they exist, and take that into account. I have backups so I think I'm covered, I can always apply the weekend full backup and apply the weekday incrementals, but I was hoping to recover the damn thing a little quicker.