Today the Exchange CXP team released the following update rollups to the Download Center. All three releases cover Security Bulletin MS13-012 (KB 2809279). Because this is a security release, the u...
Updated Jul 01, 2019
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Released: Update Rollup 6 for Exchange Server 2010 SP2 and Exchange 2007 SP3 RU10
@Genseric: Believe your question is why have he released an RU6 for Exchange 2010
SP2 if the same updates are included in Exchange 2010 SP3?
This is done because SP2 is a supported service pack according to http://aka.ms/exchangelifecycle
Microsoft Product Lifecycle.
Customers typically install RUs quickly but take longer to deploy service packs due to reasons like Active Directory schema extension (in some SPs), any dependencies of 3rd-party add-ons/solutions, etc. RU6 also contains a security fix for
http://technet.microsoft.com/en-us/security/bulletin/ms13-012
MS13-012, as mentioned in the post, so many customers may want to deploy this immediately without waiting to update to SP3.