Computer consultation and advisory services in the fields of computer hardware, software, computer peripherals, computer systems, computer networks and computer security; technical support services, namely, troubleshooting of computer hardware and software problems; integration and configuration of computer systems and computer networks for others; information technology support services, namely, monitoring network systems via information technology service support centers and helpdesks; computer systems analysis; design and development of computer systems and computer networks for others; customization of computer hardware and software; maintenance of computer software; computer programming; testing of computer hardware and software; computer virus protection services; managing and protecting electronic messaging systems by means of anti-spam protection and filtering of unwanted e-mails; the provision of firewalls for computer networks