Details about the different schema version with different version of exchange listed here. So to me you still need to prepare the schema fort the Exchange 2010 Sp1 http://www.bhargavs.com/index.php/tag/prepareschema
Jasjit Singh Dhindsa | ITIL v3 | IASA Foundation Certified | MCITP:Exchange 2010 | Exchange 2007 | MCTS:OCS 2007 | Exchange 2010 | Exchange 2007 | MCSA:Messaging | Security | MCSE:Messaging | Security
>Will we need prepare AD any further to install Exchange 2010 SP1, or are all the updates for 2010 contained within SP3?
Yes, it is necessary.
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Although the schema extension and active directory preparation steps can run as part of the setup process when installing the first Exchange 2010 server, a good best practice is to always perform the active directory preparation and Exchange 2010 installation steps.So the very first thing we will do is to mount the Exchange 2010 SP1 media and run the following command in order to extend the schema with Exchange 2010 SP1 classes and attributes:Setup /PrepareSchemaWhen the schema has been extended successfully, we run the following command in order to prepare the Active Directory for Exchange 2010 SP1 and create the Exchange organization (if one doesn’t already exist):Setup /PrepareAD /ON:”Exchange Online DK”Finally we need to prepare the Active Directory domain (or domains if you have more than one in the forest that will have Exchange users or servers) with the following command:Setup /PrepareDomainBefore you can install Exchange 2010 SP1 on the Windows 2008 R2 servers, you must first install the following hotfixes (TechNet):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 hotfix described in Knowledge Base article 982867; WCF services that are hosted by computers together with a NLB fail in .NET Framework 3.5 SP1. For more information, see these MSDN Code Gallery pages:For additional background information, see KB982867 - WCF: Enable WebHeader settings on the RST/SCTFor the available downloads, see KB982867 - WCF: Enable WebHeader settings on the RST/SCT.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.please find below article for your referanceGirishp