Microsoft currently distributes major Windows 10 updates -- Anniversary Update, for instance -- as essentially full operating system installs, going as much 4GB in size. But that is changing starting today (for some users). From an article on The Verge: Microsoft has been promising smaller updates to Windows 10, through various methods, for what feels like years, but the company is now starting to test a new Unified Update Platform (UUP) that will make a big difference. "One of the biggest community and customer benefits of UUP is the reduction you'll see in download size on PCs," explains Bill Karagounis, a Windows program manager. "We have converged technologies in our build and publishing systems to enable differential downloads for all devices built on the Mobile and PC OS." Differential downloads only include the changes that have been pushed out since you last updated a Windows 10 PC. This new change will debut with the Windows 10 Creators Update that's expected to arrive in March, but Windows Insiders can start testing the technology in today's latest build update for mobile devices. Microsoft will start rolling this out to PC builds later this year, alongside HoloLens devices. Xbox One devices running Windows 10 won't benefit from UUP as Microsoft distributes operating system updates to consoles using different methods.