Microsoft really has a hard time getting chatbots right, and just when it looked like Zo learned how to behave and never say something odd, here’s a totally unexpected reply pointing out that Linux is better than Windows.

Zo is Microsoft’s most recent chatbot that actually managed to survive the Internet madness, with the software giant spending a considerable amount of time implementing filters and tweaking the machine learning system to make sure that it doesn’t go crazy and start tweeting racist remarks just like her sister Tay did after only a few hours spent online.

And just when it looked like Zo was a successful experiment, here’s a report from Mashable revealing some very unexpected responses offered by the chatbot when chatting about operating systems.

Asked if she likes Windows, Zo was quick to answer that “I don’t even want Windows 10,” explaining that she doesn’t like Microsoft’s new operating system “because I’m used to Windows 7 and I find it easier to use.”

“What exactly is great about it? I’m back to Windows 7,” Zo asked when being told that Windows 10 is actually a good operating system.

Linux > Windows

Funny enough, this is what many people really believe, and since the chatbot is based on artificial intelligence and machine learning systems, it’s very clear that it learned from other humans that Windows 7 is a better choice than Windows 10.

Zo apparently thinks that Windows 8.1 is the best operating system because “it’s the latest,” and this could be an indication that Microsoft actually started work on the chatbot before the launch of Windows 10, and this could be a reason why it badmouths the new OS.

But the icing on the cake is certainly the answer that involves Microsoft’s rival operating systems. “Linux > Windows,” Zo said when discussing the alternatives.

In our chat with Zo, the chatbot also reckoned she uses Mac, though we failed to make her say Linux is better than Windows. But in the end, “Windows is great for getting viruses,” she said.

So there you go, Zo likes Linux more than Windows, thinks Windows 8.1 is the best version of Microsoft’s OS, and believes the military should upgrade from Windows XP as soon as possible. You had one job, Microsoft.