Exchange 2007 sizing

Hi

We are currently running Exchange 2003 SP2 on Windows 2003 SP2 servers. We have our servers in an A/A/P Windows cluster and there about 5000 mailboxes split across the two virtual servers.

The company standard is to move to Exchange 2007. We'll be using SCC in a A/A/P setup as before.

However, we need to determine the number of storage groups, databases, hardware etc.

I know MS have a Storage Calculator. There is a great blog and details about it here: http://msexchangeteam.com/archive/2007/01/15/432207.aspx

I had some questions though I was hoping someone could help me out here with:

1. "How much mail do users send and recv a day" - how can I work this out?

2. "What is the average message size" - how can I work this out?

3. "Predict IOPS value" and "IOPS per mailbox" - we have Blackberry devices here. I know that the calculator can work out the value for us, based on the some factors, but should we gather IOPS value from our existing Exchange 2003 set up an use that?

4. Regardless of the answer to the question above, I'm interested to know what our current IOPS value is in Exchange 2003. Can someone explain how to get this?
smith1974Asked:
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PenguinNCommented:
I have an Excel sheet that creates some numbers but I can´t validate if these are correct. The number of IOPS you need has been cut down by the use of exchange 2007. You now probably use 3500IOPS estimated on 5000 users. With the introduction of exchange 2007 based on 5000 users you need around 3000IOPS. I know you need heaps of RAM but you already found the sizing guide so there is no use pointing you there.

Microsoft has some information on this but they come up with different numbers (But could be a help if you did not find it before).
Exchange 2003 http://technet.microsoft.com/en-us/library/bb125019(EXCHG.65).aspx 
Exchange 2007 http://technet.microsoft.com/en-us/library/bb124518(EXCHG.80).aspx 

Lastly Exchange 2010 deals even better with IOPS so be sure to check http://technet.microsoft.com/en-us/library/ee832789.aspx although it wasn’t your question.
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