Microsoft have release Update Rollup 2 for Exchange Server 2010 Service Pack 2. full information available here, http://support.microsoft.com/kb/2661854.
Don’t forget (as I almost always do – only in the lab of course) to run fscutility /disable to disable Forefront before you run the update. More on how to do that here, http://support.microsoft.com/kb/929076. Just remember to enable it afterwards using, fscutility /enable.