[otrs] Can't create PID PostMasterPOP3, because it's already running

hi, we have otrs 2.2.6 running on a windows 2003 server with apache and mysql. everything works pretts fine... if there were no entry in the otrs.log file telling me that it could not create PID postmasterpop3: [Wed Jul 16 11:20:03 2008][Notice][Kernel::System::PID::PIDCreate] Can't create PID PostMasterPOP3, because it's already running actually i did some research on the web... the only thing i found out, were that there should be some entries deleted in the otrs db table process_id. but there is nothing in this table. should there be something on a windows server? what exactly does this notice in the log mean as everything works pretty good? thanks for your replies. regards, patrick.