PC shipments in Japan surpassed 4 mln units in Q1 2007, a 6.8% decline from Q1 2006. Both deskbased and mobile PC segments are expected to register year-over-year declines. The slow mobile PC growth was artificially affected by inventory control for the spring model releases. Some vendors intentionally reduced shipments at the end of the Q1 2007 in order to prepare for the spring models that are being introduced in April, Gartner says.