Howdy all, Perhaps someone can help me with an issue I am having with my Exchange server. NT4 domain with win2k servers as well, Single Exchange site, running Exchange 5.5. Enterprise w/SP4 on a Win2k server. Since Wednesday, the private and public information stores have been shutting down. Restarting the service(s) do not work, I have to reboot the server in order to get Email up and running. 1-In the event logs, the first indication of trouble is where I get many Event Id errors 4117-Event Type: Error Event Source: MSExchangeIMC Event Category: Internal Processing Event ID: 4117 Date: 5/3/2004 Time: 9:15:40 AM User: N/A Computer: MAILSERV1 Description: An error was returned from the messaging software the Internet Mail Service uses to process messages on the Microsoft Exchange Server. As a result, the message in spool file K1T4D3QC failed to be delivered. The message has been moved to the IMCDATA\IN\ARCHIVE directory. Data: 0000: 73 05 01 00 05 40 00 80 s....@.? 2-Then, I start receiving notifications that my end users can no longer "authenticate into their email account"- Event Type: Failure Audit Event Source: MSExchangeIS Private Event Category: Logons Event ID: 1023 Date: 5/3/2004 Time: 9:15:40 AM User: N/A Computer: MAILSERV1 Description: MEDIVIEW\muser was validated as /o=mediview/ou=MEDIVIEW/cn=Recipients/cn=muser but was unable to log on to /o=mediview/ou=MEDIVIEW/cn=Recipients/cn=muser 3-Lastly, I'll see a lot of Event ID 1101 errors- Event Type: Error Event Source: MSExchangeIS Private Event Category: Background Cleanup Event ID: 1101 Date: 5/3/2004 Time: 9:16:18 AM User: N/A Computer: MAILSERV1 Description: Error 0xfffffbd3 occurred on message b-FE94FC during a background cleanup. After all this, the information stores simply shut down. I have logging turned on (minimal) for Message Transfer & SMTP Interface events. If I need to record more info to solve this issue, what other Diagnostic logging should I have turned on and at what level? thanks, Greg CONFIDENTIALITY NOTICE: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential information and privileged information. Any unauthorized retention, review, printing, copying, disclosure or distribution is prohibited. If you are not one of the intended recipients, please contact the sender by reply email or phone, destroy all copies of the original message and keep the information contained here confidential.