Hey Waheb09,
Some of the features that were shown at the Build conference are not included in Windows Developer Preview. Please see the quoted information below from the
Building Windows 8 blog:
"NOTE: The preview build does not include every feature shown this morning. Shown but not in the Developer Preview release include the Windows Store, Windows Live Metro style apps, and some of the user interface features. The
focus of the preview is the API and development tools for building Metro style apps."
Reference:
Building Windows 8 - Welcome to Windows 8 - Developer Preview
You can download Windows Live Essentials 2011 from the link below to be able to use Windows Live Messenger as a desktop application in Windows Developer Preview.
Windows Live Essentials 2011
Steven
