Microsoft is expecting big things with Windows 10, and could have more than 410 million PCs running its new OS within 18 months, according to Net Applications. The largest migration will be from Windows 8 and 8.1 users, with three-fourths of them migrating to Windows 10 in less than two years - with a smaller number of Windows 7 also choosing to upgrade.
There will be a major push by Microsoft to get users to upgrade, though it could be difficult to convince users to leave behind Windows 7 at a fast rate.
"Enterprises will use the fourth quarter of 2015 as a learning experience," said Stephen Kleynhans, analyst at Gartner, in a statement to ComputerWorld. "They'll watch what happens on the street with upgrades. They'll see 2016 as an opportunity to roll up their sleeves and start."