Microsoft has warned the 800 million Windows 10 users about significant risks, including data breaches and identity theft, if they do not upgrade to Windows 11. Users received emails urging them to check upgrade eligibility or consider new hardware, emphasizing that lack of security updates increases vulnerability to malware and cyberattacks. The support for Windows 10 will officially end on October 14, raising concerns about exploitation of unsupported PCs. Microsoft highlights the importance of security updates and promotes the enhanced security features of Windows 11, stating that the upgrade is complimentary for eligible PCs running licensed Windows 10.