EXPERT RESPONSE
The Local Security event log will tell you who and when a given user logged on to the Exchange server. The Domain Controller Security event log will tell you who logged on to a specific mailbox and when they did so. You can use the Exchange System Manager (ESM) to view the last account that accessed a specific mailbox and at what time.
The system account logs on to mailboxes periodically, so don't panic if you see that the local system account accessed your mailbox. It was most likely your antivirus software scanning your mailbox.
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Related information from SearchExchange.com:
Expert Advice: View when a mailbox or public folder was last accessed
Expert Advice: Track, monitor and log all email communication
Expert Advice: Checking logs for Outlook Web Access logon attempt
Fast Guide: Troubleshooting Exchange Server Event IDs
Reference Center: Exchange Server monitoring and logging resources
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