KB2661277 Android/Iphones stuck with 451 during Cross forest proxy in datacenter
KB2678414 Contact name doesn't display company if name fields are left blank
Note that this fix will not cause the CAS to CAS OWA proxying incompatibility with Exchange 2007 as discussed here. No additional updates are required on Exchange 2007 for proxying to work once Exchange 2010 SP2 RU2 is installed.
Note for Forefront Protection for Exchange users For those of you running Forefront Protection for Exchange, be sure you perform these important steps from the command line in the Forefront directory before and after this rollup's installation process. Without these steps, Exchange services for Information Store and Transport will not start after you apply this update. Before installing the update, disable ForeFront by using this command: fscutility /disable. After installing the update, re-enable ForeFront by running fscutility /enable.