Hi matnor,
Nice for you. 16GB mem if hefty enough for 400 users I believe. I'd setup 1000 users mailbox for a public university here using 4GB mem, around 200MB to 2GB mailboxes at random.
To plan for future expansion, maybe you can opt for more disk spindles (eg: 8x146GB) to have more IOPS capability. If you need some sizing advices feel free to PM me!
Thanks! |