Windows XP Service Pack 3 (SP3) includes the following:
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* All previous security patches and fixes released for Windows XP.
* All enhancements and new features that were included with Windows XP SP1 and Windows XP SP2
* Only two new features have been added: Black Hole Router Detection Windows and Network Access Protection (NAP).
* The following are already available for Windows XP in stand-alone updates. Windows XP SP3 includes them by default (System administrators must choose to install each of these updates): MMC 3.0, MSXML6, Microsoft Windows Installer 3.1 v2, Background Intelligent Transfer Service (BITS) 2.5, IPsec Simple Policy Update for Windows Server 2003 and Windows XP, Digital Identity, Management Service (DIMS), Peer Name Resolution Protocol (PNRP) 2.1, Wi-Fi Protected Access 2 (WPA2).

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Windows 7 (formerly codenamed Blackcomb and Vienna) is the next release of Microsoft Windows, an operating system produced by Microsoft for use on personal computers, including home and business desktops, laptops, Tablet PCs, and media center PCs.
Microsoft stated in 2007 that it is planning Windows 7 development for a three-year time frame starting after the release of its predecessor, Windows Vista, but that the final release date will be determined by product quality.

Unlike its predecessor, Windows 7 is intended to be an incremental upgrade with the goal of being fully compatible with existing device drivers, applications, and hardware. Presentations given by the company in 2008 have focused on multi-touch support, a redesigned Windows Shell with a new taskbar, a home networking system called HomeGroup, and performance improvements. Some applications that have been included with prior releases of Microsoft Windows, most notably Windows Mail (formerly Outlook Express), Windows Movie Maker, and Windows Photo Gallery, are no longer included with the operating system; they are instead offered separately as part of the Windows Live Essentials suite.

Windows 7 - It's the next version of Windows for PCs, and it's the result of working hand-in-hand with our partners and with people who use Windows in the real world every day. We're paying particular attention to the things they're telling us are important to them and will make their PCs work the way they want them to - things like enhanced reliability, responsiveness, and faster boot and shut-down. We're also trying to make their everyday tasks easier, like connecting and syncing devices, browsing the web, and managing a home network.

Of course, we're also working on new capabilities, so people will be able to do things with Windows 7 that were difficult (or perhaps impossible) to do with PCs before. Finally, we're working hard to ensure that Windows 7 will run on any PC and work with any program that works today with Windows Vista, so upgrading from Windows Vista will be easy.