Some of you will remember we had a session on this a while back at one of the meetings.

Wel in case anyone needs it, here is a link to a great resource on how to calculate storage requirement (IOPS etc) for Exchange 2003.

http://www.microsoft.com/technet/prodtechnol/exchange/Guides/StoragePerformance/fa839f7d-f876-42c4-a335-338a1eb04d89.mspx?mfr=true

?

Edit:

Just thought I would add a few more links:

http://www.microsoft.com/downloads/details.aspx?FamilyID=C6084D20-9730-4FFC-805D-B957327604C6&displaylang=en

http://www.msexchange.org/tutorials/Art-Science-Sizing-Exchange2003-Part1.html

http://technet.microsoft.com/en-us/library/bb123945.aspx

Hope it helps

Cheers

Nathan