Today the Exchange Team released Rollup 4 for Exchange Server 2010 Service Pack 2 (KB2706690). This update raises Exchange 2010 version number to 14.2.318.2.
When running ForeFront Protection for Exchange, make sure you disable ForeFront before installing the rollup and re-enable it afterwards, otherwise the Information Store and Transport services may not start. You can disable ForeFront using fscutility /disable and enable it using the fscutility /enable command.
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.
You can download Exchange 2010 SP2 Rollup 4 here.