Bill Gates caught humming 'Yesterday When I Was Young'

Unbelievable, but the world is apparently ignoring the fact that Windows is exactly 20 years old today.

Remember the interface from the picture? On 20 November 1985 Microsoft launched Windows 1.0. Hardly any applications worked under the new OS, which was based on DOS2.0 and supported 256 colours.

As the name indicates, you could open more than one window at a time, but active windows had to be on top and could not be overlapped, which made it very inconvenient to show more than one window at a time. Judging by the lack of attention for this 20th birthday Microsoft itself isn't exactly proud of what it achieved at the time.