As Microsoft gets set to release Windows 7 on 22 October, Apple is planning an aggressive marketing campaign to encourage users to switch from PCs to Macs.
Because of Vista's disappointment, more customers than usual are likely to upgrade their Microsoft software than in past Microsoft operating system upgrades.
Reports have said Apple intends to take advantage of the number of people wanting to buy new systems.
"It presents a very good opportunity for us," Apple marketing vice president Philip Schiller told Business Week.
Business Week said Apple is likely to make the case that PCs are more susceptible to viruses than Macs.
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