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.
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Tue10Apr2012
Mainstream Support refers to updated designs and features and other cosmetic changes and support provided by Microsoft that do not fall under security updates.
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Tue09Oct2012
Microsoft Office 2007 left the end of Extended Support on October 10th, 2017, and no longer receives security fixes. Mainstream Support, which also included bug fixes, ended October 9th of 2012. These dates are for Office installations that included Service Pack 3. Un-updated versions ended Extended Support on January 13th, 2009, Service Pack 1 support ended January 13th, 2010, and Service Pack 2 support ended January 8th, 2013.
The product was launched January 7th, 2007.