CWmike writes "Microsoft will support full upgrades to Windows 8 only from the three-year old Windows 7, according to a report Thursday by ZDNet blogger Mary Jo Foley. Citing unnamed sources, Foley said that Microsoft has informed select partners of the upgrade paths to Windows 8. While Microsoft may be revealing upgrade paths to some partners, it has been much more reticent to keep customers informed than three years ago when it rolled out Windows 7. Among the details the company has not disclosed are the on-sale date and the pricing of the two retail editions. By this time in 2009, Microsoft had revealed both: On June 2 that year, it pegged a launch date for Windows 7, and by June 25 had not only posted prices for the operating system but had also kicked off a pre-sale that discounted upgrades by as much as 58%. The increased secrecy from the company was demonstrated best last week, when it unveiled its first-ever tablet, the Surface, but left many questions unanswered, including the price, sales date, and even the hardware's battery life."