Exchange 2010 SP1 OWA Error

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We are getting the following error after logging into OWA. Prior to SP1 OWA was working fine. We have a separate CA server. The other roles are on another server. Both servers have been upgraded to SP1. The clients are working fine and so are " i" devices. OWA is the only app that is getting this error.

We have about 2300 mailboxes.

I have checked to make sure there is no host name configured in IIS under the bindings.

I have reset owa vd.

Nothing has worked so far.

Any help would be greatly appreciated.





User host address: x.x.x.x
EX Address: /o=/ou=First Administrative Group/cn=Recipients/cn=
SMTP Address:
OWA version:
Mailbox server:
Exception type: System.IO.FileNotFoundException
Exception message: Could not load file or assembly 'Microsoft.RightsManagementServices.Core, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
Call stack


Microsoft.Exchange.Security.RightsManagement.RightsManagementException..ctor(RightsManagementFailureCode failureCode, LocalizedString message)

Microsoft.Exchange.Security.RightsManagement.Errors.ThrowOnErrorCode(Int32 hr, LocalizedString contextMessage)

Microsoft.Exchange.Security.RightsManagement.DrmClientUtils.GetServiceLocation(SafeRightsManagementSessionHandle sessionHandle, ServiceType serviceType, ServiceLocation serviceLocation, String issuanceLicense)

Microsoft.Exchange.Data.Storage.RightsManagement.RmsConfiguration.FirstOrgServiceLocationsCache.Refresh(Boolean throwExceptions)


Microsoft.Exchange.Data.Storage.RightsManagement.RmsConfiguration.Load(Boolean isDataCenter)






Microsoft.Exchange.Clients.Owa.Premium.ConversationUtilities.LoadConversation(UserContext userContext, OwaStoreObjectId owaConversationId, PropertyDefinition[] requestedProperties)

Microsoft.Exchange.Clients.Owa.Premium.ReadConversation.OnLoad(EventArgs e)



System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)


After talking to MS Support they had me run this command: Set-OwaVirtualDirectory " servername\owa (default web site)" -IRMEnabled $false

Replacing servername with your server name.

This solved the strange error we were getting.

Still not sure SP1 was a good idea to install just yet.



Even i had the same issue in Dev environment, but not with Prod. I had to run the same command to fix it.
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