Today is your absolute last chance to upgrade to Windows 10 free of charge. Starting tomorrow, you'll have to shell out $119 for a copy.
The occasion marks not just the end of an offer, but also the end of Microsoft nagging you to upgrade, and the imminent launch of the Windows 10 Anniversary update (set for Tuesday, August 2).
Windows 10 has received a lot of criticism over Microsoft aggressive tactics surrounding the upgrade process as well as the Windows Store. Conversely, it's garnered a lot of praise for being more desktop friendly than Windows 8, as well as its performance benefits (particularly in games), among other perks.