Why would Microsoft buy Groove? Do they see it as a valuable technology for them, maybe. Do they want to thumb their nose at IBM, maybe that too. But nobody spends $80 million just for spite. I see Microsoft’s move as an admission that they are worried, worried about where IBM is going and the threat it poses. For years everyone has focused on the Notes/Exchange battleground, but behind the scenes, the larger war is being fought, and Microsoft is starting to lose ground.