The Exchange 2010 SP2 RU7 update contains the changes for MS13-061. For more details, see the MS13-061 security bulletin.
The Exchange 2010 SP3 RU2 update contains fixes for a number of customer-reported and internally found issues, as well as, the changes for MS13-061. For more details, including a list of fixes included in this update, see KB 2866475 and the MS13-061 security bulletin. I would like to specifically call out the following fixes which are included in this release:
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2837926 Error message when you try to activate a passive copy of an Exchange Server 2010 SP3 database: “File check failed”
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2851419 Slow performance in some databases after Exchange Server 2010 is running continuously for at least 23 days
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2855083 Public Folder contents are not replicated successfully from Exchange Server 2003 or Exchange Server 2007 to Exchange Server 2010
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2859596 Event ID 4999 when you use a disclaimer transport rule in an environment that has Update Rollup 1 for Exchange Server 2010 SP3 installed
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2860037 iOS devices cannot synchronize mailboxes in an Exchange Server 2010 environment
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2861118 W3wp.exe process for the MSExchangeSyncAppPool application pool crashes in an Exchange Server 2010 SP2 or SP3 environment
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2863473 Users cannot access Outlook mailboxes that connect to a Client Access server array in an Exchange Server 2010 environment