I am a K-12 school district with one Exchange 2007 SP1/RU4 server (multiple roles installed). I am approaching 600 users and to date have had no issues to speak of performance-wise. Due to budget issues, I have not been able to invest additional resources to this server till now. I am adding storage for mailboxes and LCRand have just put in place a Microsoft DPM 2007 server for my backup solution ( I am really liking it so far and was a 10th of the cost Symantec was going to charge me).So taking into consideration these added processes and having the money to increase my RAM to say about 16GB, am I going against best practices by going above the 8GB of RAM number that I keep coming up with when using the "sizing utilities" out there?I'm asking this question because I thought I remember reading at one time early on that having more than 8GB of RAM on a multi-role install actually hurt performance, so I'm looking for a little clarification.

Hi,You might be looking at older recommendation for Exchange 2007 RTM.Recommended memory for multiple role based serveris 8GB + 2-5MB per mailbox and maximum 32GB and I don't think so it hurt performance. But it is also recommended to built CCR/SCC cluster if you have high number of users on stand-alone server for high availability during disaster, server failure or scheduled downtime for patching [ as opposed to single LUN protection given by LCR and if budget permits :) ]Planning Memory Configurations http://technet.microsoft.com/en-us/library/bb738124.aspx Amit Tank || MVP - Exchange || MCITP - Exchange 2007 || http://ExchangeShare.WordPress.com

Thanks... I guess I was remembering something from way back when I first designed out my server right after Exchange 2007 came out.