We can’t miss Multi Tasking anymore.
Unix based systems always had, and Windows based systems have since 1995, I don’t know about Mac OS Classic.
But, how good are the OS’s at Multi Tasking?
Which features do they have?
Here’s the test.

 

Windows 7

Mac OS X 10.6

Ubuntu 9.10

Scrolling

In active window only, wherever the cursor is. (4)

In any window, where the cursor is available, but no direct clicks. (7)

In any window, where the cursor is available, with direct clicks. (9)

Multiple desktops

Download and install a 3rd Party App (all open Apps in taskbar). (2)

Native, keyboard shortcuts only (all open Apps in Dock), only 4. (6)

Native, expandable using Compiz Fusion (open Apps hidden in Panel of their desktop), as many as you like. (8)

Multiple file managers

Multiple windows only. (5)

Multiple windows only. (5)

Multiple windows and Tabs. (7)

Hide options

Shake: Everything is hidden exapt for active window.
Hide all: Everything is hidden.
Minimalize: 1 window is hidden. (7)

Hide
others: All open Apps are hidden, exapt for all windows of the active App.
Hide all: Everything is hidden.
Minimalize: 1 window is hidden. (9)

Roll up: Only titlebar is visible.
Hide all: Everything is hidden.
Minimalize: 1 window is hidden. (8)

Internet connections

Only 1 at a time, other categories needed for wireless. (3)

Not tested.

Multiple things (WiFi, LAN, Tethering) at the same time allowed. (9)

Multiple UI’s

Aero only.
KDE is installable, alone with Aero. (5)

Darwin only. (1)

KDE, LXDE, IceWM, Xfce, Awesome, and more installable and natively running. (9)

Sticky

No. (1)

No. (1)

Right-click on title bar. (9)

Background Apps

Only Apps on the system space. (4)

All Cacao Apps. (9)

System space and start-up Apps only. (7)

User switch without logout

Yes. (7)

Yes. (7)

Yes, and use at the same time, using SSH. (9)

Windows: 3.8
Mac OS X: 4.5
Ubuntu: 7.5