Most of their revenue is tied to other stuff though

1. Productivity / Business (~43%)

Includes:

Microsoft 365 (Office, Teams) - these can be likely ported to Linux if they're not already since they also work on MacOS? LinkedIn Dynamics (ERP/CRM)

~$120.8B

2. Cloud (~38%)

Includes:

Azure (runs on mostly linux, and moving cloud provider as a big corp is expensive, I don't see massive companies stuck in azure infra moving from it) Server products (Windows Server, SQL Server, etc.)

~$106.3B

I fully support the demise of Windows as an OS

But microsoft as a company has shifted away from Windows as their source of revenue, and will probably not be impacted too badly if it were to die completely.