And can be downloaded here at the Microsoft Download Center. This update contains a number of customer-reported and internally found issues since the release of RU1. See KB2582113 “Description of Update Rollup 5 for Exchange Server 2010 SP1” for more details. Availability of this update via Microsoft Update is planned for late September. Update Rollup 6 for Exchange Server 2010 SP1 is currently scheduled to release in October 2011.