Outstanding Outlook Not Responding Windows7 software to fix the issue when MS Outlook is not responding on Windows Operating System. When MS Outlook is not responding, it is because your PST file must be corrupted. So to avoid this issue you need to fix the PST. This tool is very helpful to all kind of end users. It supports Windows 8, 7, vista, XP and 2003 Operating System. It repairs Microsoft Outlook 2000, 2003, 2007 and 2010.