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Warning:
The following hotfixes only apply to Windows Server 2008 R2 RTM. If you’re installing Exchange on Windows Server 2008 R2 SP1, you don’t need to apply these hotfixes.

The following hotfixes are required for the Client Access server for Windows Server 2008 R2 RTM:

• Install the update described in Knowledge Base article 979099, An update is available to remove the application manifest expiry feature from AD RMS clients. Without this update, the AD RMS features may stop working.
  
• Install the update described in Knowledge Base article 979744, A .NET Framework 2.0-based Multi-AppDomain application stops responding when you run the application.
  
• Install the update described in Knowledge Base article 983440, An ASP.NET 2.0 hotfix rollup package is available for Windows 7 and for Windows Server 2008 R2. For more information, see these MSDN Code Gallery pages:
  
  • For additional background information, see KB983440 - Win7 rollup package (PR for QFE 810219).
    
  • For the available downloads, see KB983440 - Win7 rollup package (PR for QFE 810219).
    
• Install the update described in Knowledge Base article 977020, FIX: An application that is based on the Microsoft .NET Framework 2.0 Service Pack 2 and that invokes a Web service call asynchronously throws an exception on a computer that is running Windows 7.
  

The following hotfix is required for Hub Transport and Mailbox servers for Windows Server 2008 R2:

• Install the update described in Knowledge Base article 979099, An update is available to remove the application manifest expiry feature from AD RMS clients. Without this update, the AD RMS features may stop working.
  

The following hotfix is strongly recommended for Mailbox servers running Windows Server 2008 R2 that are members of a database availability group (DAG):
Install the update described in Knowledge Base article 2550886, A transient communication failure causes a Windows Server 2008 R2 failover cluster to stop working. Without this update, the underlying cluster for a DAG could experience a race condition that causes a loss of quorum in the cluster and a loss of functionality in the DAG.

1. On servers that will host the Hub Transport or Mailbox server role, install the Microsoft Filter Pack. For Exchange 2010 RTM, see 2007 Office System Converter: Microsoft Filter Pack. For Exchange 2010 SP1, see Microsoft Office 2010 Filter Packs. For more information about registering the Filter Pack, see Register Filter Pack IFilters with Exchange 2010.
   

   Note:
   On Exchange 2010 RTM, you can meet the prerequisite by installing 2007 Office System Converter: Microsoft Filter Pack. However, we recommend that you upgrade to the Microsoft Office 2010 Filter Packs.

2. On the Start menu, navigate to All Programs > Accessories > Windows PowerShell. Open an elevated Windows PowerShell console, and run the following command.
   
   Import-Module ServerManager
   

3. Use the Add-WindowsFeature cmdlet to install the necessary operating system components:
   
   • This example is for a server that will have the typical installation of the Client Access, Hub Transport, and Mailbox server roles.
     
     Add-WindowsFeature NET-Framework,RSAT-ADDS,Web-Server,Web-Basic-Auth,Web-Windows-Auth,Web-Metabase,Web-Net-Ext,Web-Lgcy-Mgmt-Console,WAS-Process-Model,RSAT-Web-Server,Web-ISAPI-Ext,Web-Digest-Auth,Web-Dyn-Compression,NET-HTTP-Activation,Web-Asp-Net,Web-Client-Auth,Web-Dir-Browsing,Web-Http-Errors,Web-Http-Logging,Web-Http-Redirect,Web-Http-Tracing,Web-ISAPI-Filter,Web-Request-Monitor,Web-Static-Content,Web-WMI,RPC-Over-HTTP-Proxy -Restart
     

   • This example is for a server that will host the Client Access, Hub Transport, Mailbox, and Unified Messaging server roles.
     
     Add-WindowsFeature NET-Framework,RSAT-ADDS,Web-Server,Web-Basic-Auth,Web-Windows-Auth,Web-Metabase,Web-Net-Ext,Web-Lgcy-Mgmt-Console,WAS-Process-Model,RSAT-Web-Server,Web-ISAPI-Ext,Web-Digest-Auth,Web-Dyn-Compression,NET-HTTP-Activation,Web-Asp-Net,Web-Client-Auth,Web-Dir-Browsing,Web-Http-Errors,Web-Http-Logging,Web-Http-Redirect,Web-Http-Tracing,Web-ISAPI-Filter,Web-Request-Monitor,Web-Static-Content,Web-WMI,RPC-Over-HTTP-Proxy,Desktop-Experience -Restart
     

   • This example is for a server that will host the Client Access and Hub Transport server roles.
     
     Add-WindowsFeature NET-Framework,RSAT-ADDS,Web-Server,Web-Basic-Auth,Web-Windows-Auth,Web-Metabase,Web-Net-Ext,Web-Lgcy-Mgmt-Console,WAS-Process-Model,RSAT-Web-Server,Web-ISAPI-Ext,Web-Digest-Auth,Web-Dyn-Compression,NET-HTTP-Activation,Web-Asp-Net,Web-Client-Auth,Web-Dir-Browsing,Web-Http-Errors,Web-Http-Logging,Web-Http-Redirect,Web-Http-Tracing,Web-ISAPI-Filter,Web-Request-Monitor,Web-Static-Content,Web-WMI,RPC-Over-HTTP-Proxy -Restart
     

   • This example is for a server that will host the Hub Transport and Mailbox server roles.
     
     Add-WindowsFeature NET-Framework,RSAT-ADDS,Web-Server,Web-Basic-Auth,Web-Windows-Auth,Web-Metabase,Web-Net-Ext,Web-Lgcy-Mgmt-Console,WAS-Process-Model,RSAT-Web-Server -Restart
     

   • This example is for a server that will host the Client Access and Mailbox server roles.
     
     Add-WindowsFeature NET-Framework,RSAT-ADDS,Web-Server,Web-Basic-Auth,Web-Windows-Auth,Web-Metabase,Web-Net-Ext,Web-Lgcy-Mgmt-Console,WAS-Process-Model,RSAT-Web-Server,Web-ISAPI-Ext,Web-Digest-Auth,Web-Dyn-Compression,NET-HTTP-Activation,Web-Asp-Net,Web-Client-Auth,Web-Dir-Browsing,Web-Http-Errors,Web-Http-Logging,Web-Http-Redirect,Web-Http-Tracing,Web-ISAPI-Filter,Web-Request-Monitor,Web-Static-Content,Web-WMI,RPC-Over-HTTP-Proxy -Restart
     

   • This example is for a server that will host only the Client Access server role.
     
     Add-WindowsFeature NET-Framework,RSAT-ADDS,Web-Server,Web-Basic-Auth,Web-Windows-Auth,Web-Metabase,Web-Net-Ext,Web-Lgcy-Mgmt-Console,WAS-Process-Model,RSAT-Web-Server,Web-ISAPI-Ext,Web-Digest-Auth,Web-Dyn-Compression,NET-HTTP-Activation,Web-Asp-Net,Web-Client-Auth,Web-Dir-Browsing,Web-Http-Errors,Web-Http-Logging,Web-Http-Redirect,Web-Http-Tracing,Web-ISAPI-Filter,Web-Request-Monitor,Web-Static-Content,Web-WMI,RPC-Over-HTTP-Proxy -Restart
     

   • This example is for a server that will host the Hub Transport or the Mailbox server role.
     
     Add-WindowsFeature NET-Framework,RSAT-ADDS,Web-Server,Web-Basic-Auth,Web-Windows-Auth,Web-Metabase,Web-Net-Ext,Web-Lgcy-Mgmt-Console,WAS-Process-Model,RSAT-Web-Server -Restart
     

   • This example is for a server that will host only the Unified Messaging server role.
     
     Add-WindowsFeature NET-Framework,RSAT-ADDS,Web-Server,Web-Basic-Auth,Web-Windows-Auth,Web-Metabase,Web-Net-Ext,Web-Lgcy-Mgmt-Console,WAS-Process-Model,RSAT-Web-Server,Desktop-Experience -Restart
     

   • This example is for a server that will host the Edge Transport server role.
     
     Add-WindowsFeature NET-Framework,RSAT-ADDS,ADLDS -Restart 

     http://technet.microsoft.com/en-us/library/bb691354.aspx