Windows XP Service Pack 2 (SP2) was released on August 6, 2004 and focuses on security. Unlike previous service packs, SP2 adds new functionality to Windows XP, including a new firewall, a WiFi utility, a pop-up ad blocker, and Bluetooth support. It also includes a new API to allow third party virus scanners and firewalls to interface with a new security center application which provides a general overview of security on the system. This edition helps to suppress spyware and viruses. Other features include enhancements to the Internet Connection Firewall (ICF), now the Windows Firewall (which is also turned on by default), advanced memory protection that takes advantage of the NX instruction that is incorporated into newer processors to stop buffer overflow attacks, and improvements to email and web browsing.
SP2 also includes major updates to Windows XP Tablet PC Edition and Windows XP Media Center Edition. Due to compatibility issues, the release of SP2 was delayed several times. Some major PC manufacturers such as IBM and HP have not yet finished their own compatibility testing of SP2, and have not yet recommended that their customers install the update.
