The one
thing to remember with updates is that if a machine goes down, then thats money being pissed away.(especially in the industrial control sector)
We have 8 PC powered machining centers, we charge between £45-£60/hr for them, imagine M$ release a patch that gets on to them and stops them from working for 3 days until a service tech can come in and re-image the HDDs
£50*8 machines *72 hrs ... thats nearly 29 THOUSAND pounds m$ have just cost us in lost production.
Which explains why the control manufacturer says "No loss caused by the installation of unapproved patches will by covered by us" on the windows OS controls.
And it also explains why the control manufacturer uses Linux for the OS now