He noted that while Microsoft services have been slowly returning online, the wider problem could leave businesses facing weeks of disruption.
Mr Pardo continued: “Unfortunately, there is not a huge amount you can do if your computer has the blue screen of death.
“Computer users will need to wait for their IT team to resolve the issue, and many people may need to work from their phone or use a pen and paper in the meantime.
“This is a wake-up call for all the companies that have been floored by this attack. Organisations need to urgently review their disaster recovery plans to make sure they can deal with such problems.”
Cybersecurity experts have warned the ongoing outage highlights a “critical” weakness threatening the operations of many organizations across the world.
Martin Greenfield, the CEO of cybersecurity monitoring firm Quod Orbis, noted the issue exposed an “over-reliance on single-point solutions” that has left companies vulnerable.
Mr Greenfield said: “Whilst such threats can have huge impact, steps to prevention are often quite straightforward.
“Organisations must adopt a more holistic approach to their cyber resilience, implementing a multi-layered defence strategy that encompasses not just software solutions, but also robust policies, regular training, and proactive threat hunting.
“A key component of this approach should be continuous controls monitoring, which allows for real-time visibility into the effectiveness of security measures and rapid response to emerging threats.”
Airlines, railways and television stations in the United Kingdom were being disrupted by the computer issues.
The budget airline Ryanair, train operators TransPennine Express and Govia Thameslink Railway, as well as broadcaster Sky News are among those affected.