The listings of Mailboxes that are registered on any given server are currently homed in the SystemMailbox. These registrations are populated by running the RegisterMailbox.vbs script and are listed as GUID items under the StoreEvents/Internal folder of the SystemMailbox as mentioned earlier. The inbox of the resource mailbox permanently contains an item "OnSaveForAutoAcceptAgent" (Subject, no sender) that is hidden. It is very important that one should not alter this in any way. If it is altered, the Sink will fail. If this message isn't hidden on the mailbox but is listed under the Root in Outlook the Sink will fail. This is probably due to a permissions issue.
There are 2 utilities that will allow you to open a resource mailbox and view properties of items in the mailbox including the GUID.
Exchange Explorer can be obtained from the Exchange SDK that will allow you to open a mailbox and view properties of items in the mailbox including GUIDs. More information regarding this application can be found at:
The Exchange SDK can be downloaded from
MFCMAPI can be obtained from http://support.microsoft.com/?kbid=291794
Here are the steps to use MFCMAPI to check the store event on the inbox folder of the resource mailbox.
Ensure that the user performing this process has "Receive As" rights on the Mailbox Store where the SystemMailbox resides. Follow article 821897 for more information on how to do this.
Below is a screenshot of the "OnSaveForAutoAcceptAgent" hidden message as seen with MFCMAPI.
In order to view the GUIDs within the SystemMailbox, follow steps 1-7 and navigate to StoreEvents > internal folder. Double click the internal folder to view the GUIDs of the registered mailboxes. To log into the SystemMailbox mailbox, have a look at article 253784 for the steps. As another method MFCMAPI can be used to logon to the SystemMailbox without creating an explicit profile. Log into the SystemMailbox only as a measure of troubleshooting.
Hope this was helpful!
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