> Windows launched after the Mac, into an era of slightly more powerful processors and better understanding of user behavior on truly multi-application devices. These differences led Microsoft to adopt an OS-level unified window history model.

Yet Microsoft seems to be walking away from this model.

The Windows Taskbar was built on that, but has since diverged quite a bit from that model. The Windows 95 taskbar originally showed one entry per Window, until Windows XP started grouping Windows together when the Taskbar gets too crowded. Then Windows 7 started hiding the labels and made the Taskbar into a combined program launcher/window switcher, which now made the behavior of clicking on the icon itself very inconsistent, depending on the state of the program:

- when no instance of the program is running - shows the launching program animation and launches the program and brings the window on top

- when program has one window minimized - shows the unminimizing animation and brings the window on top

- when has one window not in focus - brings the window on top

- When program has one window on top - shows the minimizing animation and minimizes the window

- When program has multiple windows - opens the Taskbar Live Preview