Clean scan engine folders for Forefront Protection for Exchange 2010

How to clean up the Forefront folders for all the scan engines used by Forefront.

Disk space can be hogged by these folder even though the update mechanism built in Forefront itself is configured to delete the old and obsolete scan-engines and pattern files.

If for some reason the disks are filling up, you can manually clean up the folders (delete its content really) and after that the update mechanism downloads the needed engines and patterns automatically.

First stop all related Exchange services:

get-service *exchange*|stop-service

The stop all related Forefront services:

get-service *fpe*|stop-service

Then delete all files in
c:\Program Files (x86)\Microsoft Forefront Protection for Exchange Server\Data\Engines\x86
&
c$\Program Files (x86)\Microsoft Forefront Protection for Exchange Server\Data\Engines\amd64

Restart the server, reenable automatic management of updates, or manually start the update process.
Watch the folders getting filled with the latest patterns and engines.