Microsoft said Friday they've experienced a cyberattack similar to the security intrusion recently reported by Facebook and Apple.

A small number of their computers, including some in the Mac business unit, were infected by malicious software, the company said. They say there is no evidence of customer data being affected. The investigation is ongoing.

The company said in a statement Friday:

This type of cyberattack is no surprise to Microsoft and other companies that must grapple with determined and persistent adversaries. We continually re-evaluate our security posture and deploy additional people, processes, and technologies as necessary to help prevent future unauthorized access to our networks.

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