> Microsoft's biggest competitor for office suites is Google Apps,

Disagree. I'm a spreadsheet-fan and Numbers (mac version of Excel) is waaay better than Google Doc's spreadsheet. In fact, Numbers rivals Excel in many ways. For those who haven't used it, Numbers is more of a container that holds all kinds of objects, like media files, text fields, and including spreadsheets. This model, I've found, is way more effective at communicating concepts that require textual descriptions alongside small blocks of spreadsheets.