Net Applications: Windows 10 reached 39.2% worldwide OS market share in December, finally surpassing Windows 7, which dropped to 36.9%
Emil Protalinski / VentureBeat :
Context & Ripple Effects
This crossover closes a long arc: after launching in 2015 and hitting 75 million devices within weeks, Windows 10 spent early 2016 looking stalled, with Net Applications showing it stuck under 10% of desktop OS share. StatCounter called the Windows 10-over-Windows 7 flip first, back in February 2018; Net Applications' December reading now confirms it on the second major tracker.
The gap is narrow — 39.2% vs. 36.9% — but the direction matters for Microsoft's upgrade push, since Windows 7 remains the largest single block of holdout machines heading into its final stretch of mainstream support.
First-order effects
- Microsoft gains a headline stat for pressuring the remaining Windows 7 base toward upgrades, with Windows 10 now the plurality OS worldwide on Net Applications' measure.
- Enterprises and ISVs still standardizing on Windows 7 now sit on the shrinking side of the split, raising the cost of deferring migration.
Second-order effects
- Software vendors and web teams can begin reordering test matrices around Windows 10 as primary, treating Windows 7 as the legacy tier rather than co-equal.
- The two-trackers discrepancy — StatCounter flipped a year earlier than Net Applications — pushes analysts to weight methodology when sizing the remaining Windows 7 fleet, affecting upgrade-campaign targeting.
Third-order effects
- If the pattern holds, each Windows generation's takeover takes years of dual-OS coexistence rather than a clean cutover — a cycle Windows 11 later repeated, per StatCounter's July 2025 data showing it ahead of Windows 10.
- Meanwhile the overall desktop pie keeps fragmenting at the edges, with Chrome OS passing macOS in 2020 annual share while Windows itself slipped — meaning intra-Windows migrations no longer guarantee total-desktop growth.
The trend: Windows version transitions are multi-year overlaps measured differently by rival trackers, with each new release cannibalizing its predecessor while the desktop share pool slowly leaks to non-Windows platforms.