I'm trying to fix this and I'm seeing it on my Exchange 2010 server. I added SCCM to Exchange Trusted Subsystem group, but the error continues. Log Name: Application Source: MSExchange RBAC Date: 9/18/2012 8:25:49 PM Event ID: 17 Task Category: RBAC Level: Error Keywords: Classic User: N/A Computer: MAIL1.domain.com Description: (Process w3wp.exe, PID 4492) "RBAC authorization returns Access Denied for user domain.com/domain Servers/SCCM1. Reason: No role assignments associated with the specified user were found on Domain Controller dc1.domain.com" Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="MSExchange RBAC" /> <EventID Qualifiers="49152">17</EventID> <Level>2</Level> <Task>2</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2012-09-19T03:25:49.000000000Z" /> <EventRecordID>95768</EventRecordID> <Channel>Application</Channel> <Computer>MAIL1.domain.com</Computer> <Security /> </System> <EventData> <Data>w3wp.exe</Data> <Data>4492</Data> <Data>domain.com/domain Servers/SCCM1</Data> <Data>dc1.domain.com</Data> </EventData> </Event>