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You are running GALSYNC and you get the following error on a conference room mailbox object:
Application Event Log
Log Name: Application
Source: FIMSynchronizationService
Date: 6/13/2013 2:04:43 PM
Event ID: 0
Task Category: None
Level: Error
Keywords: Classic
User: N/A
The description for Event ID 0 from source FIMSynchronizationService cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer. If the event originated on another computer, the display information had to be saved with the event.

The following information was included with the event: 

There is an error in Exch2010Extension AfterExportEntryToCd() function when exporting an object with DN 

CN=- Conference Rooms - Samples(2),OU=FIM,DC=domain, DC=ad.


**** ERROR ****
The property value you specified, "-1073740026", isn't defined in the Enum type "Nullable`1". Property Name: 
**** END ERROR ****

Stack Trace: at Exch2010Extension.Exch2010ExtensionClass.AfterExportEntryToCd(Byte[] origAnchor, String 
origDN, String origDeltaEntryXml, Byte[] newAnchor, String newDN, String failedDeltaEntryXml, String 
errorMessage) the message resource is present but the message is not found in the string/message table 




Provisioning to the Target Exchange environment works if you have Exchange Provisioning disable in the Management Agent. However, once you enable Exchange Provisioning to system throws a Metaverse error and continues. On the next synchronization, it does it again and duplicates the contact, on and on…



Disable the account associated with the conference room mailbox. This is the default behavior when a conference room mailbox is created.