In Exchage 2003 SP2 is the clustering a one for one Cluster or other ?

We are looking at Clustering our Exchnge 2003 Sp2 Environment .   We have 1 Front End and 3 Back End Servers.

To cluster  we would move all the databases to the SAN that part is easy enought.    Does the Exchagne 2003 SP2  Cluster Model  only allow for a one for one cluster where I would need to purchase 3 more Exchange Servers  one to cluster for Mail1 and one for Mail2 and one for Msil3 ?   Or is it more flexible than that were  I can have Say 6 total exchange Servers where any one of them can support the users in a Cluster ?
dwlinderAsked:
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Pat PribelSenior - Systems EngineerCommented:
You would really only need 1 more server (giving you 3 active and 1 passive node). It is recommended that the server hardware in a cluster be indentical.
Here are two great articles on clustering with Exchange 2003.
 http://technet.microsoft.com/en-us/library/bb123779(EXCHG.65).aspx
http://technet.microsoft.com/en-us/library/aa997507(EXCHG.65).aspx
 
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