Screenshot of Windows Server 2012 R2, showing the Server Manager application which is automatically opened when an administrator logs on, start button, taskbar, and the blue color of Aero Lite
Windows Server 2012 R2, codenamed "Windows Server Blue", is the tenth major version of theWindows NToperating system produced byMicrosoft to be released under theWindows Server brand name. It was unveiled on June 3, 2013, atTechEd North America,[5] and released on October 18 of the same year.[2] It is the successor toWindows Server 2012, and is based on theWindows 8.1 codebase. It is the final version of Windows Server to use the "R2" suffix, which had been used since the release ofWindows Server 2003 R2.[6]
It removed support for processors without CMPXCHG16b, PrefetchW, LAHF and SAHF.
A further update, formally designated Windows Server 2012 R2 Update, was released in April 2014.[7] It is a cumulative set of security, critical and other updates.[8] Windows Server 2012 R2, like previous versions of Windows Server before it and versions after it, is only compatible with64-bit processors.
It was succeeded by theWindows 10-basedWindows Server 2016. Mainstream support ended on October 9, 2018, and extended support ended on October 10, 2023. It is eligible for the paid Extended Security Updates (ESU) program, which offers continued security updates until October 13, 2026.
Upgrades from driver emulators to synthetic hardware drivers to minimize legacy support
Faster VM deployment (approximately half the time)[11]
Internet Information Services 8.5: Support for logging toEvent Tracing for Windows and the ability to log any request/response headers. To improve scalability, if IIS is configured with 100 or more web sites, by default it will not automatically start any of them. Alongside this, a new "Idle Worker Process Page-Out" configuration option has been added to application pools to instruct Windows to page-out the process if it has been idle for the idle time-out period (by default, 20 minutes).[12]
Server Message Block: Performance and event logging quality improvements, support for Hyper-V Live Migration over SMB, bandwidth prioritization management, and the ability to remove SMB 1.0 support[13]
IP Address Management (IPAM): Extended to supportrole-based access control, allowing for fine-grained control over which users can view or change configurations for DHCP reservations, scopes, IP address blocks, DNS resource records, etc. Additionally, IPAM can integrate withSystem Center Virtual Machine Manager 2012 R2 to have coordinated IP policy across both physical and virtual environments. The IPAM database can be stored in aSQL Server instance instead ofWindows Internal Database.[16]
Group Policy has a new "Policy Cache" setting which allows domain-joined machines to store a copy of the group policy settings on the client machine and, depending on the speed of access to the domain controller, use those at startup time instead of waiting for the policy settings to download. This can improve startup times on machines that are disconnected from the company network.[17] New Group Policy settings have been added to cover new features inWindows 8.1 andInternet Explorer 11, such as enabling/disabling SPDY/3 support, configuring start screen layouts, and detecting phone numbers in web pages.[18]
TLS support is extended to supportRFC5077, "Transport Layer Security (TLS) Session Resumption without Server-Side State", which improves performance of long-running TLS-secured connections that need to reconnect due to session expiration.
Hyper-V role and Hyper-V management console are added to the Essentials edition.[19]
According to the Windows Server 2012 R2 datasheet published on May 31, 2013, there are four editions of this operating system: Foundation,Essentials, Standard and Datacenter.[22] As with Windows Server 2012, the Datacenter and Standard editions are feature-identical, varying only based on licensing (particularly licensing of virtual instances). The Essentials edition has the same features as the Datacenter and Standard products, with some restrictions.[23]
Microsoft originally planned to end mainstream support for Windows Server 2012 and Windows Server 2012 R2 on January 9, 2018, with extended support ending on January 10, 2023. In order to provide customers the standard transition lifecycle timeline, Microsoft extended Windows Server 2012 and 2012 R2 support in March 2017 by 9 months. Windows Server 2012 reached the end of mainstream support on October 9, 2018 and entered the extended support phase, which ended on October 10, 2023.[24][25][26]
Microsoft announced in July 2021 that they will distribute paid Extended Security Updates for volume licensed editions of Windows Server 2012 and Windows Server 2012 R2 for up to 3 years after the end of extended support.[27] For Windows Server 2012 and Windows Server 2012 R2, these updates will last until October 13, 2026. This will mark the final end of all security updates for the Windows NT 6.2 product line after 14 years, 2 months and 12 days and will also mark the final end of all security updates for the Windows NT 6.3 product line after 13 years, 1 month and 16 days.
