Event ID 8276: Site folder could not be opened for duplicate message deletion on virtual machine

This problem can appear if the "siteFolderServer" attribute is not properly set or pointing to an old exchange server which no longer exists in your exchange organization.

Use ADSIEDIT to check "siteFolderServer" attribute on Exchange Public Information Store. Open ADSIEDIT from the Support Tools and navigate to the following location;
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1. Expand the Configuration container, and then expand CN=Configuration,CN=<DomainName>,CN=com, CN=Services, CN=Microsoft Exchange, CN=<OrganizationName>, CN=Administrative Groups
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2. Right-click the administrative group you want to modify, and then click Properties.
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3. In the Attributes field, scroll down and select the siteFolderServer attribute.
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4. Click on Edit & see for Public Information Store value. The value here must be of your Exchange Public Information Store.
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5. If you see CN=Public Information Store (Server_Name)\0ADEL:93d6e948-ce57-4284-93a0-3aabc5e2859e,CN=Deleted Objects,CN=Configuration,DC=domain,DC=com,�it means, means the Public Information Store here is non-existing / deleted and you need to edit this value to reflect the existing Public Information Store.�
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Follow the steps from http://support.microsoft.com/default.aspx?scid=kb;en-us;284200�to correct the "siteFolderServer" attribute.

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