We have almost 20 years of experience in the development of cloud-native multi-tenant information and control systems.
Within our company, we don't care about operating systems at all. E-mail, task management, time tracking, payroll accounting, ERP, IDE and whatever, everything runs in a browser and we don't use a single product/service of a third party. User interfaces are all responsive design, therefore we can even develop software (or more practically: fix smaller bugs) on our mobile phones.