I have a little Exchange box at corp. Nothing fancy, just a dual Xeon 2.8Ghz 32 bit, 2GB RAM. Yes, 2GB of RAM. A few internal disks (RAID 5 for resilience and yes I know mirroring is faster) do the OS/Apps volume and the TL volume on 3 disks each.
The Stores volume is a 7 drive fibre RAID array using an ATTO HBA. There are 4 Stores of 12GB to 50GB totalling 145GB. Nothing startling and a very average 8GB of PFs.
Yes, that was lots of numbers. But here are some more:
Largest mailbox 6.5GB.
3GB-5GB - 9 users.
1GB-3GB - 28 users.
Top 50 users account for two thirds of all emails (size wise).
Public folders receive my Spam after filtering at the border. The Bayesian filter regularly has over 100,000 items and yet the folder runs nicely.
One huge advantage to the speed of an organisation is a 64 bit domain controller with Windows Server 2003 and pots of RAM. The whole of AD runs in RAM. Oh, how I want the budget for that...
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