There is a lot of bad blood this year between Microsoft and Apple. Apple has aggressively launched a negative political-style marketing campaign against the PC giant. While this advertising blitz - you know, the "I'm a PC/I'm a Mac" shtick - has been well executed and very entertaining, it's also had an uneXPected side-effect as well. In short, it's lit a huge fire under the thousand or so people developing Microsoft's next operating system, Windows 7, and for the first time in over a decade, they're properly focused on slapping Apple upside the head. Much like Apple did with UNIX when the life of the company was on the line for OSX, Microsoft has taken Vista and made massive changes in the user eXPerience from how easy it is to use to how reliable it is and how well it integrates with the Web, including non-Microsoft sites and utilities (like iTunes). Of course, one disadvantage Microsoft has is that it's talking about most of this during the Professional Developers Conference (PDC) this week, and clearly Apple will see what was done and will have a little time to respond.