But most of us have been kicked in the knackers by M$ so many times that it still hurts.
I've wasted years of my life learning API after API, and it is always useless next time round. I no longer give a stuff about what they do. They come up with really great things like that camera gadget that goes with an ex-box, and I just ignore it because I am sick to the back teeth of being treated like a mug. Only this week I got caught out because some VBA object in excel does /not/ do what it says in the programme's own help file. They never finish anything, it's all bodge-sell-discard with them and I am sick of it.
Every damn thing I have learned about *nix still works, even fvwmcommand. There are things I learned in 1983 playing with Microsoft Xenix or in 1995 with Irix that still work in HP-UX . And Red Hat.