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Lots of Logon/Logoff events in the event viewer windows 2003

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http://serverfault.com – I seem to be getting a lot of these entries in the Security event viewer. Around 8-12 every hour. I am wondering if a) I should be worried about it? or b) what actually is going on, Can anyone help? Type: Success Audit Source: Security Category: Logon/Logoff User: Network Service or IUSR_WIN2003 Logon attempt using explicit credentials: Logged on user: User Name: NETWORK SERVICE Domain: NT AUTHORITY Logon ID: (0x0,0x3E4) Logon GUID: - User whose credentials were used: Target User Name: IUSR_WIN2003 Target Domain: WILDEBB1 Target Logon GUID: - Ta (HowTos)