Windows Vista of January 2009, it had been announced that Vista usage had surpassed Microsoft's pre-launch two-year-out expectations of achieving 200 million users. At the release of Windows 7 (October 2009), Windows Vista (with approximately 400 million Internet users) was the second most widely used operating system on the Internet with an approximately 19% market share, the most widely used being Windows XP with an approximately 63% market share. In May 2010, Windows Vista's market share had an estimated range from 15% to 26%. On October 22, 2010, Microsoft ceased sales of retail copies of Windows Vista, and the OEM sales for
Features new to Windows Vista for Windows Vista was developed with the SDL methodology, and all existing code was reviewed and refactored to improve security. Some of the most significant and most discussed security features included with Windows Vista include User Account Control, Kernel Patch Protection, BitLocker Drive Encryption, Mandatory Integrity Control, Digital Rights Management, TCP/IP stack security improvements, Address Space Layout Randomization and Encrypting File System and cryptography improvements. Additionally, Windows Vista includes a range of parental controls, which give owners of a computer a set of tools to limit what other accounts on a computer can do, and an improved Windows Firewall which