Forefront Security for Exchange : release blocked emails

Forefont Security for Exchange (before v. 2010) may use a lot of CPU/RAM and almost hangs your transport server.

If you stop Forefront, some emails (*.eml) can remain blocked in the following folders (incoming and outgoing emails) :

C:\Program Files (x86)\Microsoft Forefront Security\Exchange Server\Data\Archive\in
C:\Program Files (x86)\Microsoft Forefront Security\Exchange Server\Data\Archive\out

In order to release them, just move them to the following folder and let Exchange process them :

C:\Program Files (x86)\Microsoft Forefront Security\Exchange Server\Pickup