If you have any doubts about how fast things are changing in the technology field I recommend you take a look at a presentation recently given by analyst Mary Meeker. You can find the completed slides at:
For example, here is a slide that is worth considering.
What it basically says is that Windows based machines now represent only 35% of the market, Apple and Android together are now the dominate players. Even worse for Windows is that both iOS and Android continue to grow at accelerating rates.
If you are in the IT market in any way shape or form you need to spend some time and have a look at all the information in the slide deck. I am confident that you’ll walk away having learnt something (good or bad).