Earlier today the Exchange CXP team released Update Rollup 6 for Exchange Server 2010 SP1 to the Download Center.
This update contains a number of customer-reported and internally found issues since the release of SP1. See 'KB 2608646: Description of Update Rollup 6 for Exchange Server 2010 Service Pack 1' for more details.
This update contains a number of customer reported and internally found issues since the release of RU5. In particular we would like to specifically call out the following fixes which are included in this release:
Availability of this update on Microsoft Update is planned for late November.
An issue with management of RBAC roles when RU6 is partially deployed in the organization: Due to changes shipped in this update, certain warnings can be displayed when managing RBAC roles, if RU6 is not yet deployed to all servers in the organization. Please see the following KB article for more information:
Managing RBAC roles might display warnings or errors if Exchange 2010 SP1 RU6 is partially deployed in the organization http://support.microsoft.com/kb/2638351
Note for Forefront users: For those of you running Forefront Protection for Exchange, before installing the update, stop all Forefront services.