How many concurrent users do you recommend. Assume latest new hardare,
RAID-V, Scsi-wide, 3+Mhz CPU. I also thought of adding an additional server
for mail boxes.
That depends on your storage design.
"Backstage at the Server Sizing Concert"
http://blogs.msdn.com/exchange/archive/2004/05/13/131464.aspx
"Exchange Disk Sizing (it's not just for cluster anymore!)"
http://blogs.msdn.com/evand/archive/2004/10/14/242127.aspx

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> How many concurrent users do you recommend. Assume latest new hardare,
> RAID-V, Scsi-wide, 3+Mhz CPU. I also thought of adding an additional
> server
> for mail boxes.