Another possibility is that XP worked Microsoft out of a "job" (upgrade cycle) by coming, over its life cycle, to be extremely rock-solid. Most upgrade cycles

Another possibility is that XP worked Microsoft out of a "job" (upgrade cycle) by coming, over its life cycle, to be extremely rock-solid. Most upgrade cycles are initiated by a perceived lack of future compatibility in a fairly imminent time frame. If compatibility is expected indefinitely, there just isn't an incentive.