Also, already 10 years ago, corporate backends were pretty much already all running on Linux.

In big companies the stuff running in Windows has long been just been the Views in a multi-tiered Model-View-Controller systems architecture, whilst the data and logic sat in servers.

From my own experience, on the technical side it's mainly the sunk cost into making the custom frontends in Windows and certain apps used to fill the gaps not covered by corporate systems (for example Excel and Outlook) that have held Windows in place.

On the management side, it's probably a question of support contracts and friendly rather than professional relationships with specific Windows-only 3rd party vendors.

Not at all denying your point (which I totally agree with), just pointing out that in big enough companies to have their own software developers and proprietary systems, the movement away from Windows has been going on longer than that, just less visible to most people because what was being moved over was back and middle tier stuff.

Whilst people kept dreaming about the Year Of Linux On The Desktop, Linux had, since the 90s, quietly and steadilly been eating away at the responsabilities of software running on the Desktop.

I'm in the lucky position that I get to run Linux on my work machines in an otherwise Windows environment (helps that I'm in the IT dept). Enterprise apps are actually a lot better about supporting Linux these days. Zoom, WebEx, TigerConnect (healthcare focused HIPAA compliant messenger) all have native Linux versions. Also, the CrowdStrike EDR agent supports Linux too, which was helpful to get approval to run Linux. Support is good in IT specific tools too. VMWare remote console and VMWare Omnissa Horizon client also support Linux natively, so I use Horizon to connect to a VM when I actually do need Windows. Most of the Cisco management tools that aren't web based work too, e.g. CUCM RTMT, but they are in Java so not too surprising. The only stickler really is Microsoft products. I use Teams, Sharepoint and Outlook as PWA though, which is good enough for me (do all my actual document editing in LibreOffice though). Typically the only thing I actually need to log into actual Windows VM for is Windows Server Management Tools to manage AD, DHCP, DNS etc