F-SECURE POLICY MANAGER 7.0 Administrator's Manual page 201

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Both types of proxies can exist on the same network but they cannot
provide updates for the product for which they are not designed for. For
example, F-Secure Anti-Virus Proxy cannot be used to deliver updates to
F-Secure Client Security 6.x and later.
F-Secure Anti-Virus Proxy acts as a standalone server in the network,
and it can provide updates to hosts without a connection to an upstream
server. The only upstream server it can connect to is the F-Secure Update
Server.
F-Secure Policy Manager Proxy acts as a true proxy in the network and
requires a connection to an upstream server to be able to serve updates
to clients. F-Secure Policy Manager Proxy can connect to both F-Secure
Update Server and F-Secure Policy Manager Server.