I have 10 computers in my network. What should I setup to permit all computers to use Outlook for email + VPN + terminal client access and to prohibit 8 computers access to the Internet?

You can do this by setting up LAN Filters.

To setup a LAN filter:

- Enable pass as default

- Add a block entry, configure the 8 IP addresses that you want to block Web access and enter port 80 to 80, click add

- Click save&restart