Maybe he’s reading too much into Ballmer’s lack of enthusiasm. Maybe’s Steve’s mellowing. Maybe he was bummed out about having to lay off more people. Maybe he was coming down with swine flu. Or maybe “Window 7 has done quite well” isn’t “quite well” enough.

Shy and retiring Microsoft CEO Steve Ballmer seems to be having trouble finding something nice to say about Windows 7’s launch.

Analysts seem to think Windows 7 has done quite well, but the man who knows all the figures seems to be keeping uncharacteristically quiet.

When hacks at ComputerWorld asked Ballmer how Windows 7 was doing, he said “er… its fantastic… er, in Japan.”

“It is helping to spur PC sales… um… in Japan. We’ve had a great response… in Japan. The first ten days were bigger than the first ten days of XP or Vista or any other Windows launch that we have done… in Japan.”

True he was talking to a Japanese news conference, but it is rare that the great man is that specific. If it was really doing well in Japan and everywhere else we would expect him to start waving his arms, flinging chairs and shouting, “I rule the world, baby!”