– Microsoft spokesman Matt Thomlinson
During our investigation, we found a small number of computers, including some in our Mac business unit, that were infected by malicious software using techniques similar to those documented by other organisations.
We have no evidence of customer data being affected and our investigation is ongoing.
This type of cyberattack is no surprise to Microsoft and other companies that must grapple with determined and persistent adversaries.
Microsoft Corp is investigating the hacking of a small number of its computers - a breach which the software giant said was "similar" to security intrusions recently reported by Apple Inc and Facebook.