Question : Windows SharePoint Services HTTP log file, configuration, deletion and "prevention"?

Dear guys,

Scenario:
A server with Windows Server 2003 SP2 and Microsoft Office SharePoint Server 2007.

Under "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\Logs\[some ID]\" is for each (since a long time) day created one subfolder per day, having a name of the format "[YYYY-MM-DD]".
In each of the "[YYYY-MM-DD]" subfolder, is found one 00.log file.

The first line of a 00.log file says "Windows SharePoint Services HTTP log file".

In IIS exists a number of Web Sites, but none for which I see logging into the above mentioned subfolders.

Hence my questions:
1. What is creating the "[YYYY-MM-DD]" subfolders and the 00.log file?

2. Where is '1' configured?

3. Can I delete older files (and/or what is the impact)?

4. Can I prevent '1'?

Kind regards,
Soren

Answer : Windows SharePoint Services HTTP log file, configuration, deletion and "prevention"?

1) Usage Analysis Processing component. This is not related to IIS logging

2) Look at Central Administration > Operations > Usage Analysis Processing

3) You can safely delete ALL files (and folders). In fact, only the newest folder is being processed at night. Older (already processed) folders can be safely deleted. However - you must be sure that usage analysis processing already took place (it might not, eg. if server was down).

4) Turn off logging and processing in Central Administration > Operations > Usage Analysis Processing