Prerequisites for Exchange 2010 typical installation on Windows Server 2008 R2
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1. Active Directory
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• Schema master (x86 or x64): Windows Server 2003 SP1 Standard or Enterprise, or Windows Server 2008 Standard or Enterprise, or the Windows Server 2008 R2 Standard or Enterprise.

• Global catalog (x86 or x64): In each AD site where you plan to install Exchange 2010, you must have GC running - Windows Server 2003 SP1 Standard or Enterprise, or Windows Server 2008 Standard or Enterprise, or the Windows Server 2008 R2 Standard or Enterprise.

• Domain Controller (x86 or x64): In each AD site where you plan to install Exchange 2010, you must have writable DC running - Windows Server 2003 SP1 Standard or Enterprise, or Windows Server 2008 Standard or Enterprise, or the Windows Server 2008 R2 Standard or Enterprise.					
• Active Directory Forest: Forest functional level must be Windows Server 2003 or higher.


2. Active Directory Health Check Commands:
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dcdiag /test:DNS /e /v /f:dcdiag.log

nslookup gc._msdcs

repadmin /replsum /bysrc /bydest /sort:delta

If you get errors you can find more details in:

repadmin /showrepl * > showrepl.log

or in csv formatted option:

repadmin /showrepl * /csv > showrepl.csv


3. Microsoft Filter Pack - FilterPackx64.exe	(you need the x64 version of the file!)
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http://go.microsoft.com/fwlink/?linkid=137042

4. Exchange Typical installation - CAL, HUB and MBX roles
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Open PowerShell with elevated privileges and import ServerManager module

Import-Module ServerManager

then add the required Windows Features

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,RPC-Over-HTTP-Proxy -Restart


5. Set startup type of "Net.TCP Port Sharing Service" to automatic
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If you skip 5. you will get an error in Exchange 2010 Setup Wizard - prereq. check



Note:
• The account which you use for Exchange 2010 Setup wizard must be a member of Schema Admins Domain Admins and Enterprise Admins (to be able to prepare AD and the domain)
• If you are planning to use this Exchange Server as a member of a DAG (Database Availability Group) you must use Windows Server 2008 or 2008 R2 Enterprise Edition - DAG still uses pieces of failover clustering.
• Once you install Exchange 2010 on a Windows Server Stadard edition, you cannot upgrade to Windows Server Enterprise Edition
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