“This presentation can’t be opened because it’s too old”
The author might consider using Microsoft products because they are obsessive about providing backwards compatibility.  That's one of the positive things about Microsoft products.  The downside is that they have to deal with a lot of old baggage as a result.Apple, on the other hand is almost the opposite.  They're obsessive about upgrading everyone and leaving the past behind.  That's great because they're free to make bold and innovative changes.  The downside of course is that you and your files sometimes get left behind.Both are valid strategies in my opinion and appeal to different customers.  If you feel like backwards compatibility is a really important feature then whether you want to admit it or not, you probably would be happy as a Microsoft customer.