Windows 7 was released by Microsoft on October 22 2009. At that time, Microsoft committed to providing 10 years of Office 365 Support for it. This 10-year period ended on January 14 2020. Now, your PC will not receive any security updates. To get the latest ones to keep your data safe, it's imperative to upgrade to Windows 10, the most recent edition of Microsoft. Apart from that, Windows 7 users will also not receive any customer service till they upgrade it to Windows 10.