Oh dear...

Ok, so getting a laugh at Microsoft’s expense is easy. They’re very big, very cumbersome, and take themselves dreadfully seriously. And their name is the first thing most people see when they start work in the morning.
But really, does Bill Gates and his fun-loving team of thrill-seekers try to do stuff like this on purpose?

The Sydney Morning Herald - September 28, 2007

Excel glitch: it doesn't add up

Microsoft's Excel 2007 spreadsheet program is going to have to relearn part of its multiplication table.
In a blog post, Microsoft employee David Gainer said that when computer users tried to get Excel 2007 to multiply some pairs of numbers and the result was 65,535, Excel would incorrectly display 100,000 as the answer.
Gainer said Excel makes mistakes multiplying 77.1 by 850, 10.2 by 6425 and 20.4 by 3212.5, but the program appears to be able to handle 16,383.75 times 4.
"Further testing showed a similar phenomenon with 65,536 as well," Gainer wrote Tuesday.
He said Excel was actually performing the calculations correctly, but when it comes time to show the answer on the screen, it messes up.
Gainer said the bug is limited to six numbers from 65,534.99999999995 to 65,535, and six numbers from 65,535.99999999995 to 65,536, and that Microsoft is working hard to fix the problem.

And they’re asking how much for this wonderful new improved version of something most people already have?