What's new in Windows 7 ? The answer depends on the upgrade from previous version of Windows. If you are upgrading from Windows Vista than it is straightforward as Windows 7 is built on the same foundation as Windows Vista , but if you are upgrading from Windows XP, you'll find fundamental changes in nearly every aspect of the operating systems.

Windows 7 new features especially in the Enterprise and Ultimate versions. Such as:
• DirectAccess: Gives mobile users seamless access to corporate networks without a need to VPN.
• BranchCache: Decreases the time branch office users spend waiting to download files across the network.
• Federated Search: Find information in remote repositories, including SharePoint sites, and many others with a new simple user interface.
• BitLocker and BitLocker To Go: Helps to protect data on PCs and removable drives, with manageability to enforce encryption and backup of recovery keys.
• AppLocker: Specifies what software is allowed to run on a user's PCs through centrally managed but flexible Group Policies.
• Virtual desktop infrastructure (VDI) optimizations: Gives the user the ability to reuse virtual hard drive (VHD) images to boot a physical PC.
• Disk Imaging: Allows you to create a single OS image for deployment to users worldwide.

Windows 7 Edition

• Windows 7 Home Premium  This is the edition you will find installed in new PC and in consumer warehouse and in your local PC shop. Windows 7 Home Premium is same like Windows XP home and Windows Vista Home Premium.
• Windows 7 Professional  This edition includes all the features of windows 7 Home premium + some advanced networking features. Like Vista and XP Professional, Windows 7 Professional also includes remote desktop feature that enables others to connect to your Windows 7 computer across the Internet from virtually any computer. In a noteworthy change, however, Windows 7 Professional is a superset of Home Premium and thus includes all features (including Windows Media Center) found in the lesser edition.
• Windows 7 Ultimate and Windows 7 Enterprise  This both edition are identical with difference in sales chanel. Ultimate is available on retail and original equipment manufacturer (OEM) editions; Enterprise is distributed only to large customers who buy volume licenses of Windows. With Windows 7 Ultimate, you get the ability to boot from a virtual hard drive and the new BitLocker-to-go feature lets you encrypt files on your computer as well as removable disks like that USB flash drive.