[Osiris]

A non fixed Microsoft Excel 2007 has calculation issues with certain numbers. Two scenarios exist that result in a false value being shown as the result of a calculation. If the result of a calculation is a number between 65534.99999999995 to 65535 the result will be shown as 100000 instead.
The second scenario is that the result of a calculation is a number between 65535.99999999995 to 65536 which will display the result as 100001 instead. You can try it for yourself if you do a calculation of 77.1 x 850 for instance. Use the build in Windows calculator for instance to calculate the numbers and afterwards Microsoft Excel 2007.
You will see the difference immediately. Please note that only Excel 2007 is affected. Microsoft admitted that this was a display error and that Excel 2007 would use the correct figure. Microsoft released a 34 Megabyte hotfix for Excel 2007 which corrects this problem.

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Microsoft Excel 2007 Hotfix