Rude Awakening wrote with a PC World article, saying that XP sales will actually be higher next year than they were in 2007. Despite Vista's release, Microsoft admitted this week that it expects the previous version of its operating system to make up a larger percentage of its OS sales in 2008. "According to Liddell, Microsoft will generate the same revenue, more or less, under the new Vista vs. XP numbers, although there might be some slight differences because Vista sales have tended to involve more of the higher-priced versions, dubbed premium by the company, than has XP. The financial forecast didn't spell out that directly, however. The only clue was a US$120 million difference in what Microsoft pegged as the 'undelivered elements' it assigned to unearned income for the coming year."