W3SVC1 log file located in C:inetpublogslogfiles grew to 50GB on a client SBS 2003 server. Safe to delete manually. Controlled by Start>Run>%SystemRoot%system32inetsrviis.msc Web Sites > Right click Default Web Site > Properties > Enable Logging Scheduled task to keep it on but stop the log file from growing unrestricted found here on Microsoft Technet:
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