StatCounter reported a decline in Windows' market share from approximately 79% in April 2026 to 56.55% by June 2026, indicating a drop of 22.45 percentage points. However, this figure was later corrected to 72%, with expectations of a rebound towards 78%. A significant portion of the market was classified as "Unknown," representing 21.45%, likely due to misclassification of devices. StatCounter has faced previous inaccuracies, including a misreported resurgence of Windows 7 and a drop in Google's market share. The company tracks web usage through data from over 1.5 million websites, but acknowledges that its figures are estimates and can be distorted by various factors. Microsoft confirmed that Windows is installed on approximately 1.6 billion devices.