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Microsoft just released Windows 10 Build 10240, which is rumored to be the RTM (release to manufacturer) version. What’s the proof for that, what is in the alleged RTM version, and is it ready for its public release? We have investigated the latest Windows 10 Insider Preview build and compiled the evidence.

Is Build 10240 Really the RTM Version?

The build itself contains some evidence. The most curious one is the build number itself: 10240.

As The Verge points out, 10240 kilobytes equal 10 megabytes; provided you calculate with the non-simplified measure of 1024 kilobytes per megabyte Memory Sizes Explained - Gigabytes, Terabytes & Petabytes in Layman's Terms Memory Sizes Explained - Gigabytes, Terabytes & Petabytes in Layman's Terms It’s easy to see that 500 gigabytes is more than 100 gigabytes. It’s also easy to see that 1 terabyte is larger than 1 gigabyte and that is larger than 1 megabyte. But these are... Read More . It’s a clever way to express a 10–as in Windows 10–in numbers and it also matches well with Microsoft’s tradition to pick special version numbers for its RTM releases.

Number schemes aside, the build downloads as “TH1 Professional 10240”, with TH potentially standing for Threshold, the codename for Windows 10. This is the first build that requires testers to confirm the new Microsoft Software license terms (they appear to be sound). Finally, the desktop watermark, that branded all previous builds as preview versions, is missing.

Windows 10 Installing Build 10240

The strongest indicators that Build 10240 is indeed the RTM version, however, are independent statements from several trustworthy sources, including Mary Jo Foley, Brad Sams, and an anonymous OEM (original equipment manufacturer), who told German tech news page Heise Online that they had received Build 10240 from Microsoft to preinstall on devices. High time with only two weeks to go until release day!

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Only the prolific Russian leaker WZor claims that Microsoft has not signed off on Windows 10. Reddit users were quick to point out that WZor wasn’t always right and one user joked that because WZor says Build 10240 is not RTM, it must actually be the RTM version.

Is Build 10240 Ready for Public Release?

This may be the RTM version, but Microsoft must have been pressed for time and forced to release a final version that contains known issues and features that haven’t been finalized, yet. We will certainly see many patches and other updates before and after July 29. But then that’s the whole idea of Windows as a Service Windows 10: The Dream Of A Cross-Device Operating System Is Becoming Reality & It's Free Windows 10: The Dream Of A Cross-Device Operating System Is Becoming Reality & It's Free Microsoft is boldly stepping into the future with innovative software and hardware. Windows as a service and mobility of experience were the major keywords from the recent Windows 10 briefing. Most importantly, Windows 10 will... Read More –the evolution will continue.

Here are some of the things that still need work:

Overall, Windows 10 Build 10240 looks good and we haven’t had any major issues, but it’s still rough around the edges. Some design choices don’t match up and the hamburger and right-click menus are inconsistent. Testers also report various issues with the latest build, many of which we (fortunately) cannot confirm. A significant number of people even experienced issues upgrading. This just goes to show that Windows 10 won’t work equally well on every system.

In addition to bug reports, the feedback in the Insider Hub Want New Windows Features? Share Your Ideas With Microsoft & Vote Want New Windows Features? Share Your Ideas With Microsoft & Vote Microsoft wants to know what you would like Windows to look like! Propose and review Windows features to shape the next version of Windows. Read More contains many great suggestions that received lots of votes, but haven’t been addressed, yet. Time will tell whether or not Microsoft will implement more features requested by users; it’s what we would consider great service!

Will Windows 10 Be Free for Windows Insiders?

Following an unfortunate miscommunication by Gabe Aul, Microsoft has been tying to eliminate this rumor to no avail. And the latest build, which is strongly believed to be the RTM version (see above), remains permanently activated, although no Windows 7 or 8.1 license is needed to run this installation.

Windows 10 Build 10240 License

If we can believe Microsoft, this build will eventually expire. In that case, they would have to deliver an update that will check for a valid license and introduce an expiry date or lock Windows Update, which would eventually render the system unusable. Meanwhile, a slim chance remains that Windows Insiders will receive Windows 10 Microsoft Won't Reward Windows Insiders with a Free Copy of Window 10, But They Should Microsoft Won't Reward Windows Insiders with a Free Copy of Window 10, But They Should There won't be a free upgrade for Windows Insiders running the Windows 10 Insider Preview! To upgrade for free, everyone needs an eligible Windows version. Insiders can, however, upgrade to Windows 10 RTM. Read More without a license validation after all.

Windows 10 Will Be Rolling Out from July 29 Onwards

As outlined in our recent Windows 10 FAQ post Windows 10 Release Day: Everything You Need to Know Windows 10 Release Day: Everything You Need to Know The final version of Windows will be released on July 29th, but a lot of things remain nebulous. We have compiled the answers to the most frequently asked questions around Windows 10 and its release. Read More , not everyone will receive Windows 10 on July 29 10 Compelling Reasons to Upgrade to Windows 10 10 Compelling Reasons to Upgrade to Windows 10 Windows 10 is coming on July 29. Is it worth upgrading for free? If you are looking forward to Cortana, state of the art gaming, or better support for hybrid devices - yes, definitely! And... Read More .

Microsoft is instigating a staggered release because not even they have enough server capacity to upgrade one billion devices at once. By upgrading Windows Insiders and tested devices first, they also increase their chances of quickly reacting to issues with patches and bug fixes.

If you’re still hoping to join the Windows Insider program and get Windows 10 Get Windows 10: It's Not a Virus! Get Windows 10: It's Not a Virus! The Get Windows 10 icon in your system tray is not a virus. It's Microsoft's official upgrade note prior to the official release of Windows 10 on July 29th, 2015. Read More prior to July 29, you’re almost too late. Stay tuned for an upcoming post on how to still join.

If you’ve been testing Windows 10, what’s your impression of the latest build? Is it RTM worthy and if not, what is missing?

  1. Ikmal Said
    May 1, 2016 at 11:56 am

    I used the 10240 build until 30 April 2016 for real life works. No problems so far on sub-2013 laptop!

  2. Joe LaFayette
    August 4, 2015 at 3:20 am

    Downloaded Win 10 onto 3 different platforms and all have some issues. Definitely still a work in progress and probably released too early. Edge is a joke. Google Chrome crashes routinely. Cortana is worthless so far. MS... are you kidding? I don't need the hassle. This was supposed to be an improvement over the whole prior debacle.

  3. Usman Mubashir
    July 26, 2015 at 12:07 pm

    Why does MUO always tries to push people away from Microsoft ecosystem? I see articles about why we should use G.Docs or linux or how tos about mac and articles about how we can migrate from Windows. It baffles me.

    • Tina Sieber
      July 26, 2015 at 7:23 pm

      I'm sorry that you don't like to see those articles.

      Personally, I approach those different ecosystems from an "options" point of view. While I prefer Windows and enjoy many other Microsoft products, I do appreciate that not everyone is the same. Some people don't like Microsoft products, others can't afford them, and fortunately they have options!

      MakeUseOf is helping out everyone and you don't have to read the articles you don't care about.

      What topics do you think we should cover more?

      • Usman Mubashir
        August 2, 2015 at 11:39 pm

        Its not that I don't like those articles, I don't think this should be the strategy MUO should be going in.
        more than half the people don't even know how to use Windows or Office which is going to be used in over three quarters of professions. Only a very minute percentage of people will ever go to the trouble of having a Linux.

        In most articles, it seems though MUO is saying like "hey Windows is old, get Linux or get that" that should be left up to the people to decide, though I may be reading you wrong entirely.

        Where this is coming from is that MUO was one of the first sites I discovered for my computer knowledge and it got me to install Linux. I used it for a while but the lack of support for educational software that I needed meant I went back to Windows. Then apart from a few articles mainly pointing at the flaws in Windows 8 I couldn't find many things that MUO should have that I found at a site run by just one man.

        I'm just trying not to sound angry because I'm not, I just want this point to be taken by MUO a little seriously :)

        • Tina Sieber
          August 4, 2015 at 1:43 am

          Thanks for your comment, Usman. I will share your feedback with our authors.

  4. Alvin Brinson
    July 22, 2015 at 5:10 am

    God I hope 10240 isn't RTM. It completely killed networking on my Elitebook. No Wifi, No Ethernet... nothing, nada, zilch. Kept getting stuck on identifying network. Tried all the usual troubleshooting. IPConfig Release even said it "couldn't find the file specified"...

    Only fix was to roll back to 10160.

    • Tina Sieber
      July 23, 2015 at 4:43 pm

      Microsoft decided not to call any version of Windows 10 RTM, which, under their new and somewhat schizophrenic philosophy, makes sense: While Windows 10 is the final version, it will never be final or finished. Windows has been turned into a Software as a Service model, meaning it will continue to evolve.

      Build 10240 is what went out to manufacturers and what they will (initially at least) be selling as retail version. Previously, this would have been called RTM, but that terminology is outdated. Meanwhile, Insiders running the Preview have received multiple updates / hot fixes for that build. In other words, what originally went out to manufacturers is already outdated, but Windows Update will take care of it.

      I hope your issues will be fixed by the time they start rolling out Windows 10 to the public!

  5. George Rivera
    July 22, 2015 at 3:58 am

    Onedrive was working beautifully and everything was working flawlessly until today when onedrive was suddenly greyed out and says not signed in.
    I've tried numerous things to try to solve this issue but nothing worked.
    i saw one thread where a user said he did a system reset to get it working again.
    I am already knee deep into this OS with alot of apps installed. I would hate to reset my computer.

    hope they fix this issue in an upcoming update.....very upcoming!!!

    • Tina Sieber
      July 23, 2015 at 4:45 pm

      Have you tried a Refresh? Or a rollback to the previous build using Windows.old files and a new upgrade attempt? I'm sure you know about these options under Settings > Update & Security > Recovery. Good luck!

  6. DonGateley
    July 19, 2015 at 7:57 pm

    Are existing application environments including vendor drivers working well following an install? To me that is the most crucial aspect of considering an upgrade.

    My system is not the OS, it is the application environment. To find out some time down the road that a critical but infrequently used application is incompatible or otherwise impacted could be catastrophic.

    • Tina Sieber
      July 20, 2015 at 10:14 pm

      You better wait and see what other users of these applications report.

    • Donald Zeller
      July 21, 2015 at 4:56 pm

      So far I haven't had any major issues with application support, the one that have issues are the ones that Windows 7 had issues running. I would suggest doing a dual boot if you are concerned.

  7. Daniel Watkins
    July 18, 2015 at 8:17 pm

    Only 49 colors to choose from for the Start Menu and Taskbar.. can choose any color you want for the Start Menu with Start10 but no task bar color options beyond 49 and can't change color of 'Settings' app. http://imgur(.)com/a/Sr9Nz . And can't change the style of the Start Menu back to '7' styles without Start10.

    Explorer still only supports file paths up to 255 characters. Have to use TotalCommander. And no tabs though QTTabBar plugin is awesome.

    The Battery Saver guessometer of how much my screen, wifi, system is using is a joke. It has no idea how much power my screen is using; It doesn't know my laptop, if it's a CCFL or LED backlit screen.

    Paint still has horrible Zooming -> 50, 100, 200, 300, 400% etc as choices

    No showing of battery wear, voltage, power draw even though it shows the time until the battery is charged.

    No showing of hard drive S.MA.R.T. status in Disk Management.

    No built in support for .rar, .7z, archive files.

    Can't see how much data has been transferred via my computer on a WIFI network over time. Used to be able to right click on the WIFI name and click on 'Show estimated data usage' on Windows 8.

    Might we see some of these features in patches? Yay, so it's the final build but probably lots of patches for people to update to on launch day. I guess that works so manufactures can start imaging there computers now.

    • Marc “Assassin” Jobs
      July 23, 2015 at 2:28 pm

      A lot of the stuff you mentioned can just be downloaded with 3rd party apps. If MS did all the work then there wouldn't be a point in developing software for it. I mean you really expect .rar and 7z to be built in? Let's be realistic here. Most people know .zip more than .rar and 7z since that is what most people use at work, and it has been like that for years. If people are already confused with the UI design of 8 what makes you think they'll make use of .7z and .rar over .zip?

      A lot of these are not even a priority to "most" users.

  8. Nicolas Loots
    July 18, 2015 at 6:13 pm

    Well apart from not being able to connect to servers unless I removed the pin code from my account, I haven't come across any major bugs yet. It's working smooth and stable on my pc most of the time. Metro apps sometimes crash a little, but that happened on 8.1 too. I'm happy with it overall.

    • Donald Zeller
      July 21, 2015 at 4:57 pm

      In what way are you connecting to your servers? I have tftp, ftp, apache and other server including intranet server that i can all connect to still using the pin

  9. Samit Tandukar
    July 18, 2015 at 5:07 am

    It has been mentioned before that Microsoft Edge won't be shipping with add-on support when Windows 10 goes to RTM, it will come sometime later this year.

    Also, One Drive is said to get massive update by the end of this year, i hope placeholder comes back at that time.

    Internal Microphone of laptops aren't supposed to support features like Hey Cortana. So, unusual behavior of Hey Cortana command was expected in these laptops.

  10. likefun butnot
    July 18, 2015 at 3:25 am

    Cortana remains the worst OS-integrated search tool in the last decade. Not because it searches Bing, although that doesn't help, but because It prioritizes search results in completely opposite fashion from what I expect from a search tool. If I type the exact name of an Application in my %path% environment variable or file in an indexed location like my Documents folder, that should come up first, but Cortana consistently displays those results LAST, something that's particularly galling given the hardware specs of my main testing machine. It's actually faster for me to hit Win + R and type "start (name of file I want to open)" than it is to search with Cortana for local files.

    Most of the rest of the bugs and features don't bother or concern me. Other than broken search, 10 is a step up from either 7 or 8.x.

    I did think that Windows 98 and Windows Vista were still rather buggy when they went to release. 10 won't be the first or most buggy Windows version that's ever shipped. It's really quite usable.

    • Tina Sieber
      July 18, 2015 at 4:00 am

      Yes, and the good thing about Windows 10 is that it's designed to receive patches and updates quickly, not just once every month. I'm actually downloading the first service update for Build 10240 right now and it looks massive...or maybe my Internet is just that slow. They should really note the size next to updates.

  11. Davin Peterson
    July 18, 2015 at 2:23 am

    I had discovered by accident that I can change the screen resolution in both the settings and Control Panel. Both Settings & Control Panel have duplicate things

    Also, Internet Explorer 11 is still included with Windows 10 even though Microsoft Edge is the new browser.

    • Tina Sieber
      July 18, 2015 at 3:53 am

      Internet Explorer 11 is supposed to stay because Windows has to support legacy sites. Edge doesn't support Silverlight, but Internet Explorer does.

  12. Xavier S.
    July 18, 2015 at 2:09 am

    I hope for heck that The Sims 2 will work without issues. It has tons on Windows 8 (black screen whenever I click anything, anyone?). If so, then I'm sticking with trusty old Windows 7.

    • Brandon Crabtree
      July 20, 2015 at 1:11 am

      Sims 2, 3, and 4 work on my windows 8 machine, and in the 10 preview. Sounds like your install was borked.

  13. Juan Sebastián Camargo Visbal
    July 18, 2015 at 1:16 am

    What you're commenting on Control Panel and File Explorer isn't going to happen.
    Most of this is more wishing new features instead of bugs. The OS was feature complete a few months ago.

    A few Metro apps still crash on startup, small live tiles for simple apps like Scan and Calc look odd on the Start menu (no padding), some things exhibit weird behavior still especially UI wise, and there's no mention of the Messages app. Does are legitimate complaints, not 'I want X feature but MS didn't put it there'.

    • Tina Sieber
      July 18, 2015 at 1:57 am

      Well, I pointed out things that are obviously in progress and things announced by Microsoft. That's quite different than requesting new features. :)

      Fact is, Control Panel features have largely been transferred to the Settings app and with some features now available on both sides, this process looks incomplete. Sure, the feature is there, but it's not finished.

      Microsoft promised more changes for the File Explorer in December and what they delivered since then (nothing!?) was underwhelming. I think there is more to come other than Quick Access.

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