Microsoft has officially concluded automatic security updates and support for Windows 10 as of Tuesday. Users with newer computers are encouraged to upgrade to Windows 11, as there will be no automatic transition. Those with older machines have alternatives, including a one-year plan for extended security updates for a fee, and a free option that requires linking a OneDrive account for cloud backup. Nathan Proctor estimates that around 400 million computers may be left vulnerable due to the end of Windows 10 support. Users unwilling or unable to upgrade can consider alternative operating systems like Chrome Flex or Linux Mint, but some applications may not work on these platforms. Installation of a new operating system can be done independently or with professional help.