Applications: Microsoft officials have said that many of the traditional Windows accessories and applications that were bundled in Vista (including the Windows Mail e-mail client and image and video editors) will not be included in a standard Windows 7 installation. Instead, you will have the option of downloading Web-based Windows Live apps (as described on the third page of this story).User Account Control Revisited
Microsoft has said that the underpinnings (APIs and logo requirements) of the User Account Control security feature in Windows Vista won't change in Windows 7, but the actual user experience will. Intended to prevent unauthorized software installations, UAC is one of the most controversial features in Vista, drawing wide criticism for its intrusiveness. As a result, Microsoft says new features in Windows 7 will allow developers to reduce the number of User Account Control prompts, thereby speeding up application installations.
Improved graphics: Though Windows Vista's Aero environment is designed to take advantage of the power available in modern graphics processors, Microsoft apparently believes that more remains to be done. Among other things, company blogs have devoted considerable ink to discussing how applications could be optimized to look better on high-DPI (dots-per-inch) displays.
Energy-efficient computing: A description for a session at this October's Microsoft Professional Developers Conference says that with Windows 7, software developers will find it easier to design applications that "do not negatively impact mobile PC battery life."
World support: Another PDC session blurb says Windows 7 will include new globalization support that will make it easier to change the languages and other location-related features of applications.
Server version: This won't be a major release. In fact, Microsoft has said that the server version of Windows 7 will be what was originally planned as Windows Server 2008 release 2 (the initial release, hailed as one of the most significant Windows Server upgrades in years, is less than a year old, having shipped last February).
The names of the 25 engineering groups working on Windows 7 suggest other areas where Microsoft will be tinkering. An entire group is devoted to wireless networking, for example. A documents and printing group is no doubt an effort to build support for the XPS (XML Paper Specification) document-printing format introduced with Windows Vista. In addition, the presence of a group called "Find and Organize" suggests that Microsoft has not yet finished working on Windows' search capabilities.
Microsoft plans to reveal many more details at both PDC and the Windows Hardware Engineering Conference in early November. Ironically, however, even as it geared up for these milestone events, the company announced it would extend the cutoff date for providing discs for Windows XP Professional to new Vista PC buyers who wish to downgrade. Originally slated to end on January 31, that program will now continue through the end of July 2009.