There are some significant changes coming for users of Office 365. Currently you can connect older versions of Outlook (2010, 2013 and 2016) to Office 365 to receive mail and access files.
The versions you connect is changing, meaning you will need to change Office versions more frequently or move to Office 365 ProPlus which is the subscription version of office.
Starting October 13, 2020, Office 365 ProPlus or Office perpetual in mainstream support will be required to connect to Office 365 services. Mainstream support. Microsoft will offer mainstream support for a minimum of 5 years from the date of a product’s general availability
This means if you are using Office 365, or planning to you need to consider the version of Office you have:
Office 2010 – Stops working with 365 October 2020
Office 2013 – Stops working with 365 October 2020
Office 2016 – Stops working with 365 2021
Confused about Office versions, our friend Doug explains below