How to Resolve Event ID 8207 Source MSExchangeFBPublish Exchange 2007

Event ID : 8207
Category : General
Source : MSExchangeFBPublish
Type : Error
Message : Error updating public folder with free/busy information on virtual machine . The error number is 0x80004005

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This problem occurs because the Exchange 2007 Server public folder database is missing its previously established replicas.

Resolution:

In the Exchange Management Shell, run the following command:

get-publicfolder -Identity "\NON_IPM_SUBTREE\SCHEDULE+ FREE BUSY" -Recurse |fl

Verify that the replica object for SCHEDULE+ FREE BUSY exists in the administrative group.

free/busy data may appear as follows: (note replica data is blank)

Name : EX:/o=ORG NAME/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)
ParentPath : \NON_IPM_SUBTREE\SCHEDULE+ FREE BUSY
Replicas : {}

In the Exchange Management Shell, run the following command:
set-publicfolder -Identity "\NON_IPM_SUBTREE\SCHEDULE+ FREE BUSY\EX:/o=ORG NAME/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)" -replicas "Server\Second Storage Group\Public Folder Database"

Note This command syntax assumes that the Exchange Server 2007 public folder database is in the default location under the second storage group.

Verify that the legacy administrative group now has a replica object by issuing the following command:
get-publicfolder -Identity "\NON_IPM_SUBTREE\SCHEDULE+ FREE BUSY" -Recurse |fl

Note the free/busy data now shows a replica object.

Name : EX:/o=ORG NAME/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)
ParentPath : \NON_IPM_SUBTREE\SCHEDULE+ FREE BUSY
Replicas : {Public Folder Database}
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This error will also record if public folder replication was defined with another exchange server which has been removed from the network. In this case, remove reference to the old exchange server from the Replication tab for each public folder in the Public Folder Management tool in Exchange Management Console.

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Source: http://support.microsoft.com/kb/945602