The count in one line of a report doesn't match the number of records in the next report when I drill down on that line. What kind of log files does LogJam work on? The count in one line of a report doesn't match the number of records in the next report when I drill down on that line. The count should match something when you drill down. But it might not be the number of records. Instead, it might be the total or even something else. If you can't find something that matches the count, it might be that the reports are not designed properly. What kind of log files does LogJam work on? LogJam only works on W3C Extended Log File Format. It is by far the most popular format. This is the format produced by nearly every web server by default including Microsoft IIS and Microsoft Personal Web Server (PWS). As far as I know, this format is only used for web servers. That means you can not use LogJam on log files produced by other services in Windows or any other OS. In IIS and other web servers, you can choose to change the format of the log files produced.