New Mailbox Seasrch (Discovery Mailbox) http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/290ebc15-e30a-4636-98f9-3b61c75e41b0/ http://terenceluk.blogspot.com/2011/08/moving-exchange-2010-mailbox-with-new.html http://technet.microsoft.com/en-us/library/gg588318.aspx http://help.outlook.com/zh-tw/140/ms.exch.ecp.EditMailboxSearch_SearchQuery.aspx Unable to execute the task. Reason: The Discovery mailbox, a hidden default mailbox that is required to search mailboxes, can't be found. It may have been inadvertently deleted. The mailbox must be re-created before you can search mailboxes. Enable-Mailbox -Arbitration -DomainController <FQDN of root global catalog server> -Identity "SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}" [PS] C:\>Enable-Mailbox "SystemMailbox{e0dc1c29-89c3-4034-b678-e6c29d823ed9}" -Arbitration -DomainController rdc11.corp.com ...