Microsoft took a totally clean computer system and allowed it to be turned into a “zombie” for an experiment. Over only three weeks they noted that the zombie computer received over 5 million connection requests; these all came from spammers around the world. It also received 18 million spam messages, sent by 13,000 different websites. This was all to a single computer. A zombie is a computer infected with any form of malicious software, also known as “malware”, that can be used by the attacker to control aspects of the computers behavior remotely.