Today the Exchange Team released Rollup 6 for Exchange Server 2010 Service Pack 2 (KB2746164). This update raises Exchange 2010 version number to 14.2.342.3.
In addition to these fixes, this Rollup also includes a fix for the security issue described in Microsoft Security Bulletin MS13-012 and new daylight saving time (DST) updates.
As of Rollup 4, it’s no longer required to disable/re-enable Forefront Protection for Exchange using the fscutility to be able to install the Rollup properly. However, if you want to remain in control, you can disable Forefront before installing the Rollup using fscutility /disable and re-enable it afterwards using fscutility /enable.
Note that Rollups are cumulative, i.e. they contain fixes released in earlier Rollups for the same product level (RTM, SPx). This means you don’t need to install previous Rollups during a fresh installation but can start with the latest Rollup.
As with any Hotfix, Rollup or Service Pack, I’d recommend to thoroughly test this rollup in a test and acceptance environment first, prior to implementing it in production.
You can download Exchange 2010 SP2 Rollup 6 here.