In order to install Microsoft Exchange 2010 on Windows Server 2008 R2 we need some prerequisite steps to be done. Running the Microsoft Exchange Server 2010 setup and during the Readiness Checks you get the following error: “The start mode for the Net. TCP Port Sharing service must be set to Automatic before Setup can continue”.

As this is one of the pre-requisite steps for Client Access Role and to successfully pass the readiness check we must set the “Net.Tcp Port Sharing Service” Startup mode from Manual to Automatic by running this command in PowerShell.

Set-Service NetTcpPortSharing -StartupType Automatic

For Exchange 2010 Setup Pre-Requisites check the following Microsoft Topic
http://technet.microsoft.com/en-us/library/bb691354%28EXCHG.140%29.aspx