Microsoft Office
VersionMainstreamExtended
Office 2003April 14, 2009April 8, 2014
Office 2007October 9, 2012October 10, 2017
Office 2010October 13, 2015October 13, 2020
Office 2013April 10, 2018April 11, 2023
Office 2016October 13, 2020October 14, 2025
Office 2019October 10, 2023October 14, 2025
Mainstream vs Extended support

The main differences between Mainstream and Extended support are as follows:

  • During Mainstream support, updates can include bug fixes, feature changes and security fixes.
  • During Extended support, updates mainly focus on security updates. Non-security updates may still be included in special circumstances or when specifically requested (see next point).
  • During Extended support, to request non-security updates, you’ll need to purchase Extended Hotfix Support.

As an end-user, you’ll hardly realize the difference between the two as updates will still be provided until the Extended Support date has been reached.

However, once a product has reached its Mainstream Support date, it is generally recommended to start planning to upgrade to a newer version.

Microsoft Operating System
Windows 10 version historyDate of availabilityEnd of service for Home, Pro, Pro Education, and Pro for Workstations editionsEnd of service for Enterprise and Education editions
Windows 10, version 1909 November 12, 2019May 11, 2021 May 10, 2022**
Windows 10, version 1903May 21, 2019December 8, 2020December 8, 2020
Windows 10, version 1809November 13, 2018May 12, 2020May 11, 2021**
Windows 10, version 1803April 30, 2018November 12, 2019November 10, 2020
Windows 10, version 1709October 17, 2017April 9, 2019April 14, 2020
Windows 10, version 1703April 5, 2017*October 9, 2018October 8, 2019
Windows 10, version 1607August 2, 2016April 10, 2018April 9, 2019
Windows 10, version 1511November 10, 2015October 10, 2017October 10, 2017
Windows 10, released July 2015 (version 1507)July 29, 2015May 9, 2017 May 9, 2017

* Windows 10, version 1703 for Enterprise, Education, and IOT Enterprise editions were released on April 11, 2017. 
** Serviced for 30 months from release date per September 6, 2018.

Second five-year extended support phase that begins in 2020 and extends until October 2025