The Windows 10 Anniversary Update brings a number of new features to Microsoft’s latest operating system – some more significant than others -- but expect some annoyances as well. Windows 10 is a solid operating system that is receiving a good slew of bug fixes and feature enhancements free of charge, on a potentially free OS upgrade (if you came from a Windows 7 or 8 PC).
After the update you may notice some icons and shortcuts you had probably deleted, like the Windows Store or the Edge browser icon on the taskbar, have been added back. That's just old Microsoft keeping to old ways, but that's easily fixed. Deeper Cortana integration has also been a controversial subject ahead of the Anniversary Update release, but for the most part this can also be tweaked, disabled or ignored completely.
Now, something that may not be as obvious is that the big update is treated almost like a Windows upgrade. To keep on the safe side, Microsoft's install setup saves a full copy of your current Windows installation (that's the Windows.old directory right there), and while this will come handy in case something goes wrong or you need to revert back, it will also occupy several gigabytes of precious storage.