
This activity of MRT is similar to what most anti-malware vendors have and it can be optional. The EULA stated that the information on detected items is sent to Microsoft servers to help Microsoft in analyzing any errors in removing, if any and to find out how many family of malware that their free tool has removed.

On first run of MRT, you are presented with EULA. When downloading MRT from Windows Update, the old version is automatically replaced by newer build or version of MRT.exe. MRT is updated every second Tuesday of each month with new detection or updated detections of malware that it can detect. You can manually download the tool and extract to replace the old version. No installation is required because the tool is downloaded by Microsoft via Windows Update and placed it in the system32 directory of Windows. Windows 7, Vista, XP and earlier operating systems by Microsoft will be able to run the Malicious Software Removal Tool (MRT). MRT is available via Windows Update, Automatic Updates or Microsoft Download Center.

It’s been four years since Microsoft released the free Windows Malicious Software Removal Tool (MRT.exe) and it has removed prevalent malware on systems running Windows 2000, XP, Windows Server 2003 and Vista.
