Microsoft deactivated the offline telephone activation back in december last year. But now in my current project we need to activate Windows Pro and the Office Suite in an offline enviroment. Microsoft established a new process which I think is working pretty good.

At first I read that the offline activation is not possible anymore for OEM licenses, but in the documentation page for the new activation process states that it is possible to activate Retail, OEM and Volume / CSP licenses in this portal.