Microsoft has confirmed that it will be providing a version of Windows 7 specifically developed for netbooks and sub-notebook computers, as well as at least one version for consumers, and one for enterprise users. Microsoft also confirmed a bunch of new Windows 7 features, such as the extension of its disk-encrypting technology BitLocker to USB thumb drives. These drives can be encrypted within Windows 7, and accessed on other Windows 7 machines through My Computer by using a password.
An update for Windows Vista will be made available, allowing it to at least unencrypt and read drives secured with BitLocker on Windows 7, if not write to them itself. When asked, Microsoft couldn't confirm whether a similar update would be made available for XP.