Create a Windows scheduled task that will delete the log files regularly:

1. Save the script below as a vbs file on a local directory (i.e., delete_old_IISLogs_30days.vbs):
    

   On Windows Server 2008 and 2012, change the locations indicated on Call DeleteOldLogFiles to C:\inetpub\logs\LogFiles\ (default location).

   Option Explicit
   
   ' Delete all IIS Log Files older than 30 days
   Call DeleteOldLogFiles("C:\WINDOWS\system32\LogFiles\W3SVC3", 30)
   Call DeleteOldLogFiles("C:\WINDOWS\system32\LogFiles\W3SVC4", 30)
   Call DeleteOldLogFiles("C:\WINDOWS\system32\LogFiles\W3SVC5", 30)
   
   Function DeleteOldLogFiles(strPath2Logs, intDays2Keep)
   Dim fso, f, fc, f1, strFiles
   
   strFiles = ""
   
   Set fso = CreateObject("Scripting.FileSystemObject")
   If (fso.FolderExists(strPath2Logs)) Then
   Set f = fso.GetFolder(strPath2Logs)
   Set fc = f.Files
   
   '-- Determine if file is older than defined days
   For Each f1 in fc
   If DateDiff("d", f1.DateLastModified, Now) > intDays2Keep Then
   strFiles = strFiles & f1.Name & vbCrLf
   f1.Delete(True)
   End If
   Next
   
   Set f1 = Nothing
   Set fc = Nothing
   Set f = Nothing
   End If
   Set fso = Nothing
   
   End Function

    

   A couple of changes was made especially in the "Delete all IIS Log Files older than 30 days" section. You can also change the logfile path and number of days (the current value is 30) based on your preferences.
2. On the OSCE server, go to Control Panel > Scheduled Task.
3. Double-click Add Scheduled Task, follow the wizard and provide the following information:
   1. Browse the script that Windows will execute: delete_old_IISLogs_30days.vbs
   2. Task Name: Delete IIS Logs older than 30 days
   3. Set Schedule: Daily
   4. Set Start Time: 00:00
   5. Set Start Date: <Same Day>
   6. Enter Domain Admin Credentials
4. Click Finish.

The scheduled task will run daily starting at 00:00 on the day of creation.