The below End of Support Calendar shows all 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.
End of extended support refers to the date when Microsoft no longer provides automatic fixes, updates, or online technical assistance. Without Microsoft support, you will no longer receive security updates that can help protect your PC from harmful viruses, spyware, and other malicious software that can steal your personal information.
Includes all programs within this version of Microsoft Office, but the security problems apply in particular to software that receives information from the Internet: Outlook.
End of extended support refers to the date when Microsoft no longer provides automatic fixes, updates, or online technical assistance.
Mainstream support (non-security bug fixes and feature updates) of this version of Office ended April 14, 2009.