Ah like QuickTime 7.6.6 and then next Quicktime 10.0? By Apple. I guess Apple doesn't know anything about versioning either, eh?
Is it correct that you cannot choose "large contact pictures" in combination with sorted contacts (all online first)?
... I am back on 5.2 ...
Yeah - UI sucks. But there is enough space on 27"
Skype 2.8 still exists and has existed, and is supported in all versions of OS X. Skype 5.x is a fork from the original Skype which means .. nothing really, but according to you it is another product.
They are two different applications with two different features. Does it make sense now?
Of course not, because you don't even know anything about versioning. First of all, as proven by Apple time and again: versioning is completely arbitrary. Higher number indicates (but doesn't guarantee) a newer version of a product (though sometimes it may not even be the same product, see FCP 7 and FCP 10)
Higher number certainly doesn't indicate a better product, again see QT7 v. QT10 (where 7 is way better), FCP 7 v. FCP 10 (where again 7 is way better) and according to many Skype 2.8 v. Skype 5.3 (where they would claim 2.8 is way better)
You don't understand versioning, so here's my advice: stop trying to explain it.
)))) Goddd. Playing with words is nice. Dude I'm a Java/ OS X / iOS developer and I use these things in my daily work. Versioning has rules. It's not just about numbers and increment them randomly based on your mood. You even don't understand what does a fork of a software mean. Higher numbers should have been more revised. There are minor examples by which a software just skipped one or two number and jumped to another number and by those softwares developers made fun of them because of this (just like now with Skype). Two different applications means that the code behind has main differences (even tough the core could remain the same). Skype 2.8 and 5.x are not two different applications. The latter is the newer version of the former. They just jumped to version 5.x because they wanted to have it in sync with windows and make a buzz. There are major differences in QT 10.x in comparison with QT 7.x (new technologies) that's why they made it as another application (new icon, preferences and when you install one of them it does not overwrite the other one etc. etc.). And for your information: Skype killed the version 2.8 right after that they introduced version 5.x but because there were many complaints about the UI they just put a link the download. Apple didn't do that with QT. If you really want to learn something so learn it but if you want to just discuss like a teenager without reasoning, I'm not here to waste my time with someone who is into MS Mac war stuff. 
And read at list this article before arguing http://en.wikipedia.org/wiki/Software_versioning#Separating_sequences
That's all well and great, and yet reality shows that versioning is completely arbitrary - so what you're talking about is more of a guideline.
BTW, I'm not into MS Mac war stuff. I'm an exclusive Mac user since 1994 and never even owned a Wintel. I criticize and praise anyone who deserves it, Apple or MS.
But really, it was just funny to have you full of indignation that Skype "apparently" doesn't know "versioning" as if it is some kind of an art, and that Apple (which doesn't know anything more about versioning than Skype or Microsoft with their Windows 7 version 6.1) has some sort of zen knowledge of the subject - which couldn't be farther from the truth.
Yes there are guidelines for versioning, but when it comes down to it, it's arbitrary and mostly in control of the marketing department.
One can bash Skype for many things, but claiming they don't know versioning or that Skype 5.x isn't really 5.x is ... amusing.
And read at list this article before arguing http://en.wikipedia.org/wiki/Software_versioning#Separating_sequences
