Windows 10 Technical Preview Build 10049 now available Since the release of build 10041 for PCs we’ve continued to make steady progress, and as I said in the blog post with that one we’re working to bring you builds to the Fast ring faster than before. Builds last week were BIG ones for us as well, since “Project Spartan” was integrated into our flighting branch for the first time. That’s right, this means that today’s release includes the new Project Spartan browser and you’ll get to use it for the first time on PCs as it begins to show up across the Windows 10 device family.