To install exchange Server 2010, you need to firstly extend the schema. You can do this by using these commands and to achieve this you need to be a member of the schema, enterprise, and domain admin groups.
setup /PrepareSchema
Setup /PrepareAD /OrganizationName:ZA
setup /PrepareDomain
NB: Exchange Server 2010 is available only in 64-bit edition and you can make the best of it, if you install it in Microsoft Windows Server 2008 R2. Before installing exchange 2010, you have to install its pre-requisites.
The Initial configurations are as follows: Configure “NetTcpPortSharing” service to start automatic. and install the “Microsoft Filter Pack”
Now you should be able to kick off the exchange server 2010 installation from the setup.