Important Windows 8.1 Release Notes
Typically, the release to manufacturer version of Windows is the final build (compilation) that is sent to large corporate clients before it is released to the retail marketplace in areas like Windows Update, the Windows Store, and made available as an official slipstream retail bundle in stores.
Typically, in the past, with the release of service packs, that solve many security vulnerabilities and issues as a compilation of Windows Updates, the RTM is sent to partner companies so that they can essentially brand the new version and prepare it as a bundled release on OEM systems. This means that the package is sent to large computer manufacturers so that they can add their own branded software, and, potentially, device drivers, to provide an optimal experience to the purchasers of new computers.
With the release to manufacturer version of Windows 8.1, it was initially unclear as to whether or not these would be the final "bits", or the final compiled version of Windows 8.1, due to much online conjecture. However, the release of Windows 8.1 will likely be followed by a large number of updates to the Modern UI applications, and it has now become common knowledge that these are the final bits for the software.
This makes the final version of Windows 8.1 9600.16384.130821-1623, for anyone paying attention.
The release of Windows 8.1 on MSDN and Technet follows disdain from developers and others who have paid a hefty price to gain early access to Microsoft software. Plans were initially to keep the RTM off the table to these individuals and organizations, prompting some to believe that the final retail release would be a different kernel build from the RTM - a seemingly odd set of circumstances, unfamiliar to most developers. As of the 9th of September, Microsoft did a 180 degree u-turn over this issue, responding to customer feedback and stating:
"We've listened, we value your partnership, and we are adjusting based on your feedback. As we refine our delivery schedules for a more rapid release cadence, we are working on the best way to support early releases to the various audiences within our ecosystem," said Microsoft's chief evangelist Steven Guggenheimer.
Traditionally, the RTM gives developers and corporations time to adapt their software to the updated operating system's application programming interface and code changes. It should be noted that while Windows 8.1 is essentially a service pack that cleans up a lot of interface issues in Windows 8, the kernel of the operating system has been significantly updated, and there are significant feature improvements that may not have normally been found in a traditional service pack. It may also be a way of indicating to potential customers and adopters that often cited issues with the Windows 8 interface have been resolved under the "8.1" moniker.
According to NeoWin:
In today's announcement, Microsoft said they are still making some final changes to Windows 8.1 before the OS reaches its general availability stage. That was part of the reason why the company did not at first wish to release the RTM versions publicly. However, a representative of Microsoft told Neowin that, in taking feedback from software developers, the company decided that it was in fact a good idea to release the RTM build to TechNet and MSDN users.
Microsoft does say that since the Windows team will be making some final adjustments to Windows 8.1 before Oct. 18. The RTM builds are for testing purposes only, the company says, and developers will still have to do some final app tweaking of their own when the GA build is released.
It is likely a large number of updates will be pushed out from the Windows Store and Windows Update for Modern UI apps and operating system updates, primarily because the RTM version is designated for corporations to prime the operating system for a release to their customers. Irregardless, everyone will likely have to download a large number of updates after Windows 8.1 goes "retail" in mid-October.
With that in mind, this is the gold version of Windows 8.1, and future patches from Microsoft are suspected to be forthcoming after general availability to the public; without any additional build releases coming out.
However, Microsoft still emphasizes that the RTM, this time, is still being tested. Large corporate clients such as Dell, Lenovo, HP, and many other partners, with access to the RTM, will report back difficulties that will be patched on the day of the retail release. It has widely been suspected that most semiconductor companies like Intel and AMD already have access to most of the development builds.
If you are currently satisfied with your Windows 8 experience, you should not seek out Windows 8.1. However, the Windows 8.1 Preview version is now essentially "out of date". Loyal Microsoft customers may be interested in picking up a Technet or MSDN subscription from Microsoft if they are interested in early access to Windows 8.1 Release to Manufacturer ("RTM").
Any genuine customer who happens to obtain the software should be sure to follow the important release notes listed from Microsoft at the top of this post and
confirm authenticity using the SHA1 checksums at all costs. Many IT news sites are reporting that the last leaked version of the RTM build (8.1 9600.16384.130821-1623) was actually the final version.
Needless to say, those with access to this software should know what they are doing, and always make sure they back up their files. They should be certain to take all necessary precautions before deploying the software in any production environment.
It is confirmed that Windows 8.1 has been made available to academic institutions and students via Microsoft Dreamspark Premium. It is also confirmed that "RTM is RTM" and no further bit changes will be required for general availability. So, essentially, if you install Windows 8.1 RTM now, you will not be required to install an additional version again in October.