Microsoft has released Update Rollup 1 for Exchange Server 2010 Service Pack 2

Update Rollup 1 for Exchange Server 2010 Service Pack 2 resolves issues that were found in Exchange Server 2010 Service Pack 2 since the software was released. This update rollup is highly recommended for all Exchange Server 2010 Service Pack 2 customers.

For a list of changes that are included in this update rollup, see KB2645995.

  Update Rollup 1 for Exchange Server 2010 Service Pack 2 (KB2645995)