[jzzskijj]

I sort of understand the point for IM client, that people won't close it unintentionally. But that is solved by showing a dialog asking do you want to close. Breaking Alt+F4's functionality is such an abomination that it is impossible to understand the thought process behind the decision.

[mehwoot]

Huh? I thought the point for an IM client is that you don't need a window anywhere, if you have the icon down there. So you can close the main window, or you can separately quit the application.

[jzzskijj]

Well, in Skype (and Windows applications in general) there is a MINIMIZE button for that, next to X and maximize. Why make X also act as minimize?

[robhack]

Minimize puts your window in the taskbar whereas X closes the window (not in the taskbar anymore), but whether it also closes the program or not at the same time is up to the program (and ideally should be configurable). That's how I understand it at least.

[jzzskijj]

BTW: In Skype 6.18.59.106 there is an option for "Keep Skype in the taskbar while I'm signed in." When it is unchecked, minimize and X behaves as you said.