Today all clients are detected again by the SOA.
I have only worked on all the clients.
After the last update of the Antivirus to 8.0.1606 via the SOA-console, on all Windows 7 clients the WAC showed a warning, that no Antivirus was detected.
I started every client in safe-mode and remove Avast using the avastclear-program. After a restart, I reinstalled the Avast-Antivirus via the SOA-console.
I donot understand, why the clients are detected again by the SOA now.