Do I need to install update rollups in order for Exchange 2010?

Today I'm going to answer a simple question I get asked all the time. You have just setup a new Exchange 2010 SP1 server. As of this writing we are currently up to Exchange 2010 SP1 Update Rollup 5.

Do we need to install Update Rollups 1 through to 5 in order?

The answer is no. Exchange Update Rollups are cumulative. Cumulative means it contains all previous hotfixes. Exchange 2010 Update Rollup 5 also contains update rollups 1-4.

You only need to install the latest service pack followed by the latest update rollup.