I have a SBS 2008 server but reasonatly I moved to a Google apps so do not use the exchange functionality. I currenty opened the default ports on my firewall recommended by MS. Ports 25, 80, 443 , 987 and 1723. I also do not use a VPN. I have a client who is reviewing my securiy and they wants me to close all these ports. Will this affect anything and how unsafe is it to have these ports open?