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        UPDATED: Windows 8.1 Hits Release-to-Manufacturing Stage
        
        
        
			- By Chris Paoli
- August 26, 2013
Windows 8.1, the update to Microsoft's Windows 8 operating system, has been released to manufacturers, according to reports from sources.
UPDATE, 8/27: Microsoft confirmed Windows 8.1 and Windows 8.1 RT have hit RTM in a blog post Tuesday.
Windows 8.1 is scheduled to become generally available in October. Microsoft has not confirmed whether Windows 8.1 has reached RTM, but Windows  SuperSite's  Paul Thurrott Tweeted on Friday that the final build number is 9600.16384.130821-1623.
 The date fits Microsoft's previously discussed timeline. Tami  Reller, corporate vice president and chief marketing officer for Windows,  said during July's Worldwide Partner Conference that the final Windows 8.1 build would be available to  manufacturers by the end of August.
 Redmond magazine columnist  and Microsoft watcher Mary Jo Foley wrote in a  blog post that multiple inside sources have confirmed to her that Windows  8.1 has reached RTM status.
 "I talked to another contact of mine who said the  internal RTM e-mail made the rounds inside the Windows division on August 23,"  wrote Foley. "A third source close to the company confirmed Microsoft  RTM'd Windows 8.1 on August 23, and announced internally that the quality  metrics for Windows 8.1 were back in line with those of Windows 7."
  When contacted directly by Foley, Microsoft said it had no  comment. 
 Foley speculated that the reason why an official announcement  wasn't made on Friday was so that it wouldn't overshadow the announcement of CEO  Steve Ballmer's retirement.
With the RTM status of Windows 8.1, PC and other hardware makers  can start preloading new Windows 8 machines with the  update for  product launches on Oct. 18  -- one day after current Windows 8 users will be given access to the  upgrade via a free download. 
 Previously, when a Microsoft product hits the RTM status,  the ability for IT pros to test the final build through the TechNet program  would occur shortly after. However, due to Microsoft ending the TechNet program on Aug.  1, there has been no word on whether testing of the final build would be available.
 In the meantime, Windows 8 users have had access to the Windows  8.1 Preview since late June through the Windows  Store. 
 Microsoft has not indicated whether Windows Server 2012 R2 and System  Center 2012 R2, both scheduled for release on Oct. 18, have also reached the  RTM milestone.