Alert for Excel 2007 users: Excel Can’t Multiply. If you’re doing any calculations that involve the number 65,535, you may have trouble. For example, Excel thinks 850*77.1 = 100,000, when the real answer is 65,535. And numerous calculations using 65,535 directly will give errors.
Microsoft is aware of the problem and is feverishly working to come up with a fix, or at least an explanation as to why it’s a feature and not a bug.
I only mention this because much of the world’s economy depends on calculations done by Excel. Perhaps much of the security of the world. Just in case you’re wondering.