Microsoft 365, two custom programs made specifically for the company at which I work and that only run on windows, and steam.
And before someone jumps in and is like “You can do all that on linux!”, I don’t want to use the web portal for Microsoft 365 because it’s terrible(I mean, 365 is terrible in general but the web portal is worse), I won’t be able to convince my boss to spend like an extra $10K to allow the programs to work on Linux, and yeah steam works on linux but it can be a lot of work to get certain games to run.
Blue screen of death and you defeat it by installing linux.