I am using a HP Proliant DL385 server with approx. 550 GB of hard drive space. I am currently using 40 GB for the OS. Is this enough for the OS and Exchange? I know I need to split the OS, Logs, and DBs on separate partitions, but how much should each approx. be. This Exchange server is not in production yet so if I need to wipe it clean and reinstall thats not a problem Thanks.