being released as they became available, only two update packages were released on the second Tuesday of every month until Windows Server 2008 reached its end of life - one package containing security and quality updates, and a smaller package that contained only the security updates. Users could choose which package they wanted to install each month. Later in the month, another package would be released which was a preview of the next month's security and quality update rollup. Installing the preview rollup package released for Windows Server 2008 on March 19, 2019, or any later released rollup package, will update the operating system kernel's build number from version 6.0.6002 to 6.0.6003. This change was made so Microsoft could continue to service the operating system while avoiding “version-related issues”. The last free security update rollup packages were released on January 14, 2020. Windows Server 2008 R2 A second release of Windows Server 2008 based on Windows 7, Windows Server 2008 R2, was released to manufacturing on July 22, 2009 and became generally available on October 22, 2009. New features added in Windows Server 2008 R2 include new virtualization features, new Active Directory features, Internet Information Services 7.5 and support for up to 256 logical processors. It is the first server operating system by Microsoft to exclusively support 64-bit processors, while consumer-oriented versions of Windows maintained 32-bit support until Windows 11 in 2021. A service pack for Windows 7 and Windows Server 2008 R2, formally designed Service Pack 1, was released in February 2011. Support lifecycle Support for the RTM version of Windows Server 2008 ended on July 12, 2011, and users can no longer receive further security updates for the operating system. As a component of Windows Vista, Windows Server 2008 with Service Pack 2 continued to be supported with security updates, lasting until January 14, 2020, the same respective end-of-life dates of its successor, Windows Server 2008 R2 and Windows 7. Microsoft planned to end support for Windows Server 2008 on January 12, 2016. However, in order to give customers more time to migrate to newer Windows versions, particularly in developing or emerging markets, Microsoft decided to extend support to January 14, 2020. Windows Server 2008 is eligible for the paid Extended Security Updates (ESU) program. The program allowed volume license customers to purchase, in yearly installments, security updates for the operating system for three additional years, until January