They did the same thing with Vista and 'Ultra portable'. I bought an EVEREX notebook 12.1" screen. With the standard 6 cell battery, the laptop weighed just over 4 lbs, which makes it, according to Microsoft, not an ultra portable. Therefore, the laptop also shipped with a smaller 3 cell battery, which allowed the laptop to weigh slightly under 4 lbs, and therefore, Vista could be advertised on the box as sold on an ultra portable. The problem was, the reviewers like PC World only rated the smaller battery's performance, which was poor with a Core Duo and a 3 cell battery. But it was much better with the 6, and sales were hurt because of it.
It is all semantics.
There is a great story about the rise of the Jeep in the US army. The soldiers loved their Jeeps, but they exceded the maximum weight specification set out by bureaucrats in the office... The principle of the maximum restriction was so that a set of soldiers could lift the Jeep out of the mud by hand if necessary. So a couple of strong soldiers went out to prove the bureaucrats wrong by lifting the Jeep, in spite of its slightly over maxed weight. The message was sent, and the Jeep became the staple vehicle of the Army until the introduction of the Humvee...