We have exchange 2000 server that about every 2 or 3 weeks stops receiving or sending email. I happened again today. The errors in the event log are listed below. These three event happened right before the reported problem. Thanks =20 Event Type: Information Event Source: STEMSCHED Event Category: None Event ID: 105 Date: 8/16/2005 Time: 2:30:38 PM User: N/A Computer: EX01 Description: The description for Event ID ( 105 ) in Source ( STEMSCHED ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. The following information is part of the event: The event log file is corrupt.. =20 Event Type: Information Event Source: MSExchangeSA Event Category: Monitoring=20 Event ID: 9096 Date: 8/16/2005 Time: 2:21:34 PM User: N/A Computer: EX01 Description: The MAD Monitoring thread is initialized.=20 =20 For more information, click http://www.microsoft.com/contentredirect.asp.=20 <http://www.microsoft.com/contentredirect.asp.=20> =20 Event Type: Warning Event Source: MSExchangeIS Event Category: Performance=20 Event ID: 9582 Date: 8/16/2005 Time: 1:44:21 PM User: N/A Computer: EX01 Description: The virtual memory necessary to run your Exchange server is fragmented in such a way that performance may be affected. It is highly recommended that you restart all Exchange services to correct this issue.=20 =20 For more information, click http://www.microsoft.com/contentredirect.asp.=20 <http://www.microsoft.com/contentredirect.asp.=20>