Historically, April 2017 builds were significant because they immediately preceded the global WannaCry ransomware outbreak (May 12, 2017). Windows Server 2016 build 14393.3970 included SMBv3 improvements that reduced the attack surface, though the primary vulnerability (MS17-010) was patched in March 2017. Nevertheless, organizations running .3970 were far safer than those still on older Windows Server 2012 or unpatched 2016 RTM versions. This build thus stands as a testament to Microsoft’s proactive security update strategy.
The details you've provided suggest a specific point in time for a Windows Server 2016 installation, reflecting a particular update state. Given the specifics of Windows Server 2016's lifecycle, any server still running build 14393.970 as of early 2023 would need to consider updating to a more recent version or ensuring compliance with Microsoft's support policies.
Organizations should regularly review and update their server infrastructure to ensure they are on supported builds, can receive timely security updates, and are protected against vulnerabilities.
For comprehensive support and to ensure security, consider bringing your server up to date with the latest cumulative updates and evaluating migration strategies to more recent versions of Windows Server if necessary.
(Note: The number "14393970" in your string is likely a typo for the actual build number 14393.1944 or a combination of the KB number and build number. The build 14393.970 actually corresponds to the April 2017 update, but the string explicitly mentions "April 2017 2021," confirming the intent is the April 2021 cumulative update.)
Here are the key features and highlights of this specific release:
For any Windows Server administrator tracing legacy infrastructure, build 14393.970 (KB4015217) from April 2017 represents the first comprehensive security refresh after Server 2016’s RTM. It fixed critical Hyper-V, S2D, and LSASS issues while modernizing the servicing stack for future updates.
The search for "windows server 2016 build 14393970 enus april 2017 2021" tells a common story: a system older than expected, still running in production years later, needing a clear upgrade path. If you inherit such a server in 2025 or 2026, remember: windows server 2016 build 14393970 enus april 2017 2021
Build numbers may blur, but the underlying need for stability and security on Windows Server remains timeless.
Further Reading & References
Article last updated: March 2025 (to reflect historical research for legacy systems).
Windows Server 2016, specifically Build 14393.970, represents a critical point in the operating system's early maintenance phase. This specific build, released in March 2017 via KB4016635 , solidified the "Anniversary Update" foundation for enterprise environments. Overview of Build 14393.970
Released on March 22, 2017, Build 14393.970 was a cumulative update designed to address various stability and security issues discovered after the initial launch of Windows Server 2016 in late 2016. It was distributed as part of the Long-Term Servicing Branch (LTSB), ensuring a stable platform for mission-critical workloads. Key technical aspects of this build included:
Release Media: Sourced from the SW_DVD9_Win_Svr_STD_Core_and_DataCtr_Core_2016_64Bit_English_-2_MLF_X21-22843 media, it supported both Standard and Datacenter editions.
Core Improvements: Addressed bugs in the servicing stack and provided pre-installed updates to streamline new installations. Build numbers may blur, but the underlying need
System Features: Included native UEFI support and was one of the last major server releases to maintain some 32-bit counterpart packages for specific repair tasks. Windows Server release information | Microsoft Learn
Windows Server 2016 Build 14393.970 (ENU) - April 2017 Update: A Detailed Review
In April 2017, Microsoft released an update for Windows Server 2016, bringing the build number to 14393.970 (ENU). This update was part of the ongoing effort to improve the stability, security, and performance of the Windows Server 2016 operating system. In this blog post, we will take a closer look at the details of this update, its significance, and what it means for Windows Server 2016 users.
What is Windows Server 2016 Build 14393.970 (ENU)?
Windows Server 2016 Build 14393.970 (ENU) is a cumulative update that was released on April 11, 2017. The update is also known as KB4015217 and is applicable to Windows Server 2016 systems with the English (United States) language pack installed.
Key Features and Fixes
The April 2017 update for Windows Server 2016 includes several key features and fixes, including: Further Reading & References
Notable Fixes and Changes
Some notable fixes and changes in the April 2017 update for Windows Server 2016 include:
How to Install the Update
To install the April 2017 update for Windows Server 2016, follow these steps:
Conclusion
The April 2017 update for Windows Server 2016 (build 14393.970 ENU) is an important cumulative update that includes security patches, performance improvements, and stability and reliability fixes. Windows Server 2016 users should install this update as soon as possible to ensure their systems are up-to-date and protected against known vulnerabilities.
Update History
Here is a brief summary of the updates for Windows Server 2016:
By installing the latest updates, Windows Server 2016 users can ensure their systems remain secure, stable, and performant.
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