Despite plans of expanding into other global regions and product segments, Dell was heavily dependent on U.S. corporate PC market, as desktop PCs sold to both commercial and corporate customers accounted for 32 percent of its revenue, 85 percent of its revenue comes from businesses, and Sixty-four percent of its revenue comes from North and South America, according to its 2006 third-quarter results. U.S. shipments of desktop PCs were shrinking, and the corporate PC market which purchases PCs in upgrade cycles had largely decided to take a break from buying new systems. The last cycle started around 2002, three or so years after companies started buying PCs ahead of the perceived Y2K problems, and corporate clients were not expected to upgrade again until extensive testing of Microsoft's Windows Vista (expected in early 2007), putting the next upgrade cycle around 2008. Heavily depending on PCs, Dell had to slash prices to boost sales volumes, while demanding deep cuts from suppliers.