The final quarter of last year saw a remarkable surge in US Mac shipments, with growth exceeding that of all PC manufacturers. According to a recent report by Canalys, Mac shipments grew by an impressive 25.9% year-over-year, significantly outpacing the competition. This growth propelled Apple's share of the US (non-tablet) computer market from 14.4% to 17.1%. This performance signals a potential shift in the competitive landscape, driven by both external factors and Apple's strategic initiatives.Mac Growth Outpaces PC Market LeadersWhile Apple experienced substantial growth, other players in the market also saw positive movement, albeit at lower rates. Acer recorded a 20% increase in shipments, and Lenovo saw an 11.8% rise. However, the market leaders, HP and Dell, faced a decline. HP shipments decreased by 3.6%, and Dell's fell by 2.4%. This divergence in performance highlights a changing dynamic in the US computer market, where Apple is gaining ground while traditional leaders are struggling to maintain their position.Microsoft's Windows 10 End-of-Life: A Key DriverA significant factor contributing to Apple's success may be Microsoft's decision to end support for Windows 10. Announced last year, this change will take effect in October of this year, meaning no more technical support or security updates, making continued use of the OS increasingly risky. As Microsoft stated, "After 14 October 2025, Microsoft will no longer provide free software updates from Windows Update, technical assistance, or security fixes for Windows 10. Your PC will still work, but we recommend moving to Windows 11. Windows 11 offers a modern and efficient experience designed to meet current demands for heightened security."Millions of older PCs are unable to run Windows 11, forcing businesses to replace their existing hardware. Canalys suggests that this refresh cycle presents an opportunity for companies to switch from PCs to Macs. The need to replace machines anyway allows organizations to consider alternative operating systems and hardware platforms.Apple's Strategic AdvantagesCanalys notes that "The Windows refresh cycle provides fertile ground for Apple to target both consumers and businesses that may be open to switching operating systems." Historically, concerns about manageability and compatibility have deterred larger commercial customers from adopting Apple products. However, Apple has actively addressed these issues, making its products more appealing to enterprise clients. Furthermore, Apple is implementing more competitive pricing strategies and revamping its channel partner program later this year, which is expected to further drive Mac adoption in the commercial segment. These strategic moves position Apple for continued market share gains in 2025 and beyond.A Shifting LandscapeThe surge in US Mac shipments, coupled with the decline in shipments from PC market leaders, indicates a significant shift in the competitive landscape. Microsoft's Windows 10 end-of-life is a key catalyst, prompting businesses to re-evaluate their hardware and operating system choices. Apple's strategic initiatives to address historical concerns and offer more competitive pricing are further fueling this trend. As the PC market continues to evolve, Apple appears well-positioned to capitalize on these changes and expand its market share in both the consumer and commercial segments.