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"We have removed the KnowledgeBase article because it was old and inaccurate," Apple spokesperson Bill Evans said.

"The Mac is designed with built-in technologies that provide protection against malicious software and security threats right out of the box," he said. "However, since no system can be 100 percent immune from every threat, running antivirus software may offer additional protection."

Apple's previous security message in its KnowledgeBase, which serves as a tutorial for Mac users, was: "Apple encourages the widespread use of multiple antivirus utilities so that virus programmers have more than one application to circumvent, thus making the whole virus writing process more difficult."

Security experts, while pleased that Apple would urge Mac users to install antivirus software, had warned that running multiple antivirus products could cause problems and recommended against it.