For those wondering about Microsoft exec Stephen Elop's, let me be unequivocal. It is.
Don't get me wrong. Those are both big deals--particularly Office for Linux (think Netbooks and other Web appliances). It's just that they weren't new revelations, as some thought, on Wednesday.
For those who want to hear about Office for the iPhone straight from Microsoft's mouth, here's a video interview I did earlier this year with Office development chief Antoine Leblond.