Hi, I have an Exchange5.5 on a Windows 2000 Server. Recently it has this error as well as the MSExchange Information Store Service stop everyday. Event Type: Error Event Source: MSExchangeSA Event Category: Monitoring Event ID: 1005 Date: 2/12/2004 Time: 10:38:21 AM User: N/A Computer: SERVER1 Description: Unexpected error <<0xc0040000 - Network problems are preventing connection to the Microsoft Exchange Server computer. Microsoft Exchange Server Information Store ID no: 80040115-0514-000006bf>> occurred. Any suggestion is welcome. Many thanks in advance. Ha.