I have Windows NT 4.0 SP6 it is PDC and Exchange Server 5.5 SP4 and ScanMail V 3.51. Two or three times per week information store stops with out reason In the Event Wiever I can see only these messages. How can I find what are reason for stoping information store. Event ID: 1005 Source: MSExchangeSA Type: Error Category: Monitoring 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 Event ID: 1005 Source: MSExchangeSA Type: Error Category: Monitoring Description: Unexpected error «0xc0040000 ? The Microsoft Exchange Server computer is not availabel. Either there are network problems or the Microsoft Exchange Server computer is down for maintance. Microsoft Exchange Server Information Store ID no: 8004011d-0526-000000» occured.