Version 2 of rollups have become so common these days 
The Exchange Team has released version 2 of the Update Rollup 5 for Exchange 2010 SP2 deployments. The version 1 was released a few weeks back, but was withdrawn due to a DAG related bug.
As usual, any interim updates from Microsoft PSS should be uninstalled and Forefront should be disabled before running the rollup setup.
The required services are automatically restarted when you run the setup.
Download the rollup 5 v2 here and a list of fixes can be read here
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Raj,
Might be worth mentioning that with SP2 RU4 you no longer have to disable / stop / start Forefront when applying rollups (http://support.microsoft.com/kb/2743871)
Thanks Shapi.