Thank Alex Decarli for the response, I have tried that, but Echange could not work, I have use Exchange customizing and it move mdbdata, imcdata, mtadata and dsadata to other logic driver, I need to customizing as before ? I'm waiting for helps, Thanks in advanced, Hien -----Original Message----- From: Alex Decarli [mailto:decarli@xxxxxxxxxxxxx] Sent: Tuesday, February 26, 2002 1:54 AM To: [ExchangeList] Subject: [exchangelist] RES: Help me please, http://www.MSExchange.org/ I had this experience. Try to install SP4 and clear the event log. Go to the Knowledge Base and see the articles ... I think that problem will be solved with isinteg. Alex Decarli