Does the President of your company even care about Security. Skype is basically telling you to open holes in your Firewall to allow UDP and all the nasty stuff that brings with it.
Skype actually port scans the Internet looking for machines to communicate with. It then establishes connections with them to relay your sessions. It uses all 65,535 ports to communicate. It is a proprietary protocol, so very little is known about it’s security. Be afraid, be very afraid! This software was designed by the makers of KaZaa.