Linux

The only thing better than good in the world of business is standard. Windows may be bad, but it's the industry standard for a ton of commercial applications. A lot of software that companies use are designed for Windows, from antivirus software to Microsoft's office suite to audio and video editing software and more. Every copy of Windows is also a lot more standard than Linux distros; the customizability of Linux makes it a lot harder to provide support compared to every single Windows user being locked into certain things. As far as the IT team being "lazy" or having "a lack of knowledge" on supporting Linux, they're working on the company's dollar, and unless there's a strong, justifiable reason to increase their workload by supporting another operating system, it's an unnecessary expense for the company. There certainly are cases where there are strong, justifiable reasons such as with Google, who maintains two Linux based operating systems and needs their staff to know how to work with them, or in situations where Linux substantially outperforms Windows for the tasks employees are doing to the point that supporting Linux is worth it, but "it can do most of what Windows can alongside features that don't matter to the companies' operation" isn't the best selling point