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Tier 1 Exchange 2010

ti-redes asked
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Last Modified: 2012-05-11

I would like to know what´s the real meaning of the expresion tier-1 when sizeing an exchange 2010 enviroment with the Exchange 2010 Mailbox Server Role Requirements Calculator.

I plan to migrate to 2010 and I have 4000 mailbox already.
I am using the Exchange 2010 Mailbox Server Role Requirements Calculator and I have 4 field of tier´s to fill but I do not understand what does it mean.
I have to fill one tier 1 with 4000 or two with 2000.. I really do not understand.

Any Help???

Thanks a lot
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