A couple weeks back MSExchangeteam.com posted an update on their blog…
Update 2/11/2011: Windows 2008 R2 SP1 includes the required hotfixes listed in this table — 979744, 983440, 979099, 982867 and 977020. If you’re installing Exchange 2010 SP1 on a server running Windows 2008 R2 SP1, you don’t need to install these hotfixes separately.
If you are wondering what each hotfix did you can check here.
The main thing I am trying to point out is that if you are installing Exchange 2010 with Service Pack 1 on Windows Server 2008 R2 SP1, you would only need the Microsoft Office 2010 Filter Packs.
The just-released Exchange 2010 SP1 requires the new Microsoft Office 2010 Filter Packs. SP1 setup registers the IFilters with Windows Search. You’re no longer required to run a shell or VBS script, or manually create registry entries to register the Office 2010 IFilters.
Let’s give Microsoft a big hand, for attempting to make life easier on us!