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This paper presents the generation of virus emerging from email to cellphones. Most of these early threats were self-replicating but not self-transporting, spreading from computer to computer via infected floppy disks. As more viruses were discovered, most known malware existed only in researchers' collections and not in users' machines. Malware was shift from virus to worm called Trojan horse. And different anti-virus companies deploying new tools to protect users from malware.