Right. So, which apps that you use _only_ run on microsoft, without a just as useful and usable (or more useful and usable) and interchangeable version on Mac, BSD, Linux, and/or the Cloud?

For example, some people would say "MS Project", which itself doesn't have Mac, BSD, Linux (or Cloud that I'm aware of) versions... yet there are other project software packages that are just as good, and will read/write MS Project files. I've done entire projects where the management people above the project were all using MS Project, and the Project manager and I (if I wasn't the project manager) were using a Mac package instead. The management folks never knew the difference. So, there was no connection between "best tool" (since the tools were interchangeable) and "OS platform".