The End of Support Calendar shows Microsoft Operating Systems end of support dates, whether they are the end of mainstream support that updates features and cosmetic changes, or extended support, which ends security fixes and all Microsoft technical support other than old web pages.
Microsoft Office 2010 End of Mainstream Support
Microsoft Office 2010 left the end Extended Support on October 13th, 2020, and no longer receives security fixes. Mainstream Support, which also included bug fixes, ended October 13th of 2015. These dates are for Office installations that included Service Pack 2. Un-updated versions ended Extended Support on July 10, 2012, and Service Pack 1 support ended October 14, 2014.
The product was launched July 15th, 2010.