Microsoft launched its Xbox Full Screen Experience on November 21, 2025, enabling Windows handhelds to operate with console-like interfaces optimized for controller-based gaming.[1] The feature targets devices running Windows 11 version 25H2 or later and promises improved battery life and reduced thermal throttling, positioning Windows as a competitor to Steam Deck and Nintendo Switch in the portable gaming market.[1] MSFT shares declined 1.51% to $471.22 as of 10:16 AM EST on November 21, continuing a downward trend from the prior session's close of $478.43 (-1.78% on November 20).[1] The stock decline aligns with broader tech sector softness, as NASDAQ Composite is down 0.08% while S&P 500 and Dow Jones show modest gains, suggesting the move reflects market-wide sentiment rather than negative reaction to the Xbox initiative.