My heart sank and felt I took a bad turn in life. I really wanted to work there but I had stopped using Windows for health reasons a long time ago. I wondered if it were rude to resign the same day because there was no way I would use Windows. I thought it was more honest, but at the same time I thought I may be too radical. Maybe I could be spared and still work there. My brain went into overdrive. The CTO then said "Uh, I mean Linux.", he noticed my face and continued "Don't panic, there are no Windows machines here". The whole thing lasted a few seconds.. I heaved a sigh of relief.
We try to be brutally honest with applicants, not only with the hardware but on the specifics of the job. It disappoints many who imagine they'll be doing "data science/AI" with screens that blink and computers that beep.