July 28, 2015 8:30 AM EDT
T he countdown has begun until some Windows 7 and Windows 8 users are upgraded to Windows 10 for free.
Microsoft will officially release Windows 10 Wednesday morning at 12 a.m. ET. But some users’ computers may have already downloaded the new software in the background, The Verge reports .
Microsoft will only blast out the update to some Windows users at first. The rest will be updated in waves as Microsoft fine-tunes Windows 10 and makes sure that it works on a massive scale.
Windows 10 offers a new interface, closer Xbox One integration and a new notification center. It also features Cortana, a Siri-like assistant that takes care of tasks like reminders, search and news article curation.
The 10 Most Ambitious Google Projects Google Driverless Car
The Google Self-Driving Car has been in the works since 2005 after a team of engineers won a grant from the U.S. Department of Defense to design an autonomous car. The project, which aims to reduce traffic accidents, has made headway in recent years as states passed laws permitting self-driving cars. Google plans a commercial release between 2017 and 2020.David Paul Morris—Bloomberg/Getty Images Google has been testing balloons which sail into the stratosphere and beam Internet down to Earth. Jon Shenk—AP Google's smart contact lenses. Google/AP Google Lively
Google Lively was a web-based virtual community space where users could design avatars, chat with one another and personalize their online hangout space. The project was discontinued after a six-month stint in 2008 after limited success.Google/AP Google Earth
Google's virtual map of the Earth allows users to tour the earth with 3-D satellite images. The project, which dates back to 2004, has already found significant applications in disaster relief.Google/AP Project Ara
Google's build-your-own-smartphone project allows users to customize their handsets to their own preferences, with the possibility of eliminating electronic waste by encouraging users to add hardware updates on their own terms. The team is working towards a limited market pilot in 2015.Bryan Bedder—Getty Images for Engadget Expand Disease Detecting Pill
Google unveiled its plans to disease-detecting ingestible pill in October, a project that'll let patients access their real-time health data to encourage preventative care. The pill will contain nanoparticles that can bind to certain cells and chemicals, with the possibility of detecting diseases like cancer in early stages.Getty Images Flying Wind Turbines
The flying windmill is the project of Makani Power, a wind turbine developer acquired by Google in 2013. The tethered airborne turbines will harness wind energy for the goal of producing low-cost, renewable energyAndrea Dunlap—Makani Power/AP Google+
Google's social networking platform launched in 2011, the most successful service after several flops at designing a Facebook competitor, like the now-retired Google Buzz. Today, Google+ boasts over half a billion monthly active users.Stephen Lam—Reuters Google Books
Google Books dates back to 2004, when Google partnered with libraries and universities to plan to digitize millions of volumes over the next several years. The project aims to make searching books as easy as searching the web.Getty Images More Must-Reads from TIME