Install Exchange on the node where the Exchange Setup Wizard was run for the pre-installation tasks. This is a standard Microsoft Exchange Server installation.
Refer to the Microsoft documentation for details on this installation.
While installing Exchange, note the following:
Install the same Exchange version and components on all nodes.
HA support for Exchange Server 2007 is available for the Mailbox Server role. While installing Exchange, ensure that you install the Mailbox Server role only.
To install Exchange
<drive letter>:\setup.com /mode:recoverserver
Here <drive letter> is the location where the Exchange software is located.
Refer to the Microsoft documentation for more information.