Windows is one of Microsoft’s main money makers, and the company is interested in seeing as many current Windows users move to its latest operating system as possible. However, no matter what the company does, there still are plenty of users who are on older Windows versions, including Windows XP, Windows Vista and Windows 7. ZDNet has learned that Microsoft may be working on a huge Windows 9 surprise to convince reluctant users to finally move to the latest Windows operating system available. The company is reportedly considering offering some sort of Windows 9 upgrade deal to XP, Vista and Windows 7 users, with a completely free upgrade option also on the table. This isn’t the first time free Windows 9