Exchange 2013 Requirements Calculator v5.1

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Exchange Team released first version of the Exchange 2013 Server Role Requirements Calculator

New calculator includes Mailbox server role calculator and also recommendations on sizing Client Access servers.

Some of the highlights with the calculator:

The calculator includes transport sizing (hence the name, I guess);
Accommodating for Client Access Server role with sizing for multi-role server deployments;
Support for multiple databases / JBOD volumes;
Configurable witness server location (primary, secondary or tertiary data center);
Configurable server names and database prefixes for generated scripts;
Generated scripts include script for DAG creation;
Support for single HA, Act/Pas and Act/Act distribution models

You can download the calculator from TechNet:

and documentation:

More informations about Exchange 2013 Requirements Calculator you can find here: Exchange Team Blog