I am with a samll business - rougly 30 mailboxes now to a growth of about 50 within a year to a year and half - 2 years. I have a single server at my disposal for Exchange 2007 It is a 2 processor server - each processor Xeon Dual Core 3.0 GHz (to make 4 core processors). 4 GB of RAM (wanting to get up to 8 GB at least - the server can hold 16 GB) and 6 Ultra 320 SCSI 73 GB HDs for 438 GB Raw total. I am planning to put all 4 server roles on the single server. I debating on using Raid 1/0 instead of Raid 5. What would be my best storage configuration and what size - sizes should I make the array (how for for the OS and Exchange - how much for the mailboxes, etc.) Any guidance or thoughts are appreciated. Thanks!

Hi, There is a very powerful tool Exchange 2007 Mailbox Server Role Storage Requirements Calculator in our Exchange Team blog. http://msexchangeteam.com/archive/2007/01/15/432207.aspx All you need to do is type your settings in the sheet, it will give you a very detail result. I am sure you will love it. J For more information about Exchange 2007 storage: A few basic concepts in disk sizing http://msexchangeteam.com/archive/2004/10/11/240868.aspx Configuring, validating and monitoring your Exchange 2007 storage http://msexchangeteam.com/archive/2007/01/15/432199.aspx Sincerely, Elvis