Windows 10 Launches as a Free Upgrade for 190 Countries
Released July 29, 2015 as a free upgrade for Windows 7 and 8.1 users, Windows 10 reached over 75 million devices within a month — a deliberate bet on rapid adoption over per-copy revenue.
Windows 10 became generally available on July 29, 2015, in 190 countries, offered as a free upgrade to existing Windows 7 and Windows 8.1 users — a distribution strategy genuinely unusual for a major Windows release at that point in Microsoft’s history.
The announcement and staged rollout
Microsoft announced the July 29 launch date on June 1, 2015, and released Windows 10 to manufacturing on July 15, ahead of general availability two weeks later. Rather than making it available to everyone simultaneously, Microsoft used a staged rollout, prioritizing Windows Insider participants and machines that had already been validated for compatibility before widening availability further.
Rapid, large-scale adoption
The free-upgrade strategy paid off quickly: within 24 hours, more than 14 million devices were already running Windows 10; by August 26, that figure had grown to over 75 million devices across 192 countries. The free upgrade offer itself remained available until July 29, 2016 — exactly one year after launch.
Why “free” was a deliberate, calculated bet
Charging for major Windows upgrades had been standard practice for decades — offering Windows 10 free represented a real short-term revenue trade-off, made in service of a longer-term goal: closing the gap between Windows 10 and the large installed base still running Windows 7 and 8.1, and pushing the ecosystem toward a single, more current, more securable platform faster than a paid-upgrade cycle typically achieves.
Why this launch mattered strategically
Windows 10 marked Microsoft’s shift toward describing Windows as delivered through ongoing updates to a single evolving platform, rather than discrete, separately-versioned releases the way Windows 7, 8, and 8.1 had been — a philosophy that shaped Windows’ release cadence for the rest of the decade, and one the free upgrade specifically was designed to accelerate everyone onto as quickly as possible.
Sources: Windows 10 available as a free upgrade on July 29 — Microsoft News, Your free upgrade is here — Official Microsoft Blog, Windows 10 — Wikipedia