Hi all, In the Microsoft Exchange System Objects container within ADUC I have two SystemMailbox objects. One has a mailbox reference in the 'Exchange Mailbox Store' column but one is blank. The GUID of the object with an associated mailbox is the same as the GUID of the SystemMailbox within Exchange System Manager. We only have one mailbox store and one public folder store within our domain. I found this MS article (http://support.microsoft.com/kb/274534) when googling the problem which says to delete SystemMailbox objects with blank 'Exchange Mailbox Store' attributes. However, I am not getting the errors described in the article, and am not running Exchange 2000 (domain is fully Server 2003 with Exchange 2003). Should I delete the blank SystemMailbox object or is there something else I should be doing? Thanks in advanced for all help given Andrew