Every module within SSP 7 has its own log file. In case you need support, please always provide all 3 log files.
In the example below, the Workflow Log folder contains several files:
Every month, a new log file is created. This can be configured in the IIS configuration file. Historical log files can run large, so please be aware of disk space usage and clean old log files regularly. For support, only the latest log file is relevant.