It's a pity that you cannot run Group-Office in a
state-of-the-art PHP environment, because it needs
globally registered environment variables.
The makers of PHP explicitely do not recommended to
set register_globals to "on" and this "feature"
(=security hole in 1000s of PHP-apps) is switched off
by default since PHP version 4.1.
Due the fact Group-Office is a business-orientated
application, and security definitely matters in
business-environments this I'd call the problem urgent.