Sure, Excel is instantly available. But also you get charting and formulas. Especially with formulas they've done something really right. You can transform a co

Sure, Excel is instantly available. But also you get charting and formulas. Especially with formulas they've done something really right. You can transform a column in a few seconds while keeping the old one, tweaking the new one and having a graphical preview through the chart feature at the same time. Of course every Spreadsheet software can do this, but to me that's the ultimate killer feature