In 1987 he began distributing his first antivirus product as shareware through his bulletin board. McAfee began working on a software product that could scan for viruses.

Through his bulletin board, McAfee quickly became aware that computer viruses were one of the hottest topics among the electronically inclined. As a spare time hobby, McAfee began operating his own computer bulletin board in 1986. At the time, John McAfee was working as a senior engineer for Lockheed Corporation. The business that would eventually evolve into NAI began to take root in the mid-1980s. It is estimated that 80 percent of the companies on the Fortune 100 list rely on NAI products to keep their computer networks running smoothly.

NAI currently maintains a presence in about 65 countries. Net Tools is built around two software suites: Net Tools Secure, which includes the antivirus applications that first brought McAfee to prominence and Net Tools Manager, which includes Sniffer, the network management tool created by Network General. NAI ’s flagship product is an integrated network security and management solution called Net Tools. The company was formed through the 1997 acquisition of Network General, Inc. It is also the tenth largest independent software company overall, with more than 1,600 employees worldwide and operations on six continents. (NAI) is the world ’s largest provider of computer network security and management software. Incorporated: 1989 as McAfee Associates, Inc.

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