Windows 8 fell further behind the pace of Windows Vista's uptake last month, a metric company said today, even as usage share of the new operating system continued to slowly climb. Statistics from Net Applications showed that Windows 8's January share was 2.5 percent of all Windows PCs, up from December's 1.9 percent. When what the analytics firm tagged as "touch" for Windows 8 and Windows RT were added, the January total rose slightly to 2.6 percent.