The Thunderbird email client has two add-ons that add support for Exchange, but both are paid add-ons. Owl for Exchange is the newer one and supports Exchange and Office365 email accounts using Outlook Web Access (OWA). ExQuilla for Exchange is the older one. It uses the EWS protocol and requires EWS to be enabled on your email server and domain. It supports the current release of Thunderbird but appears to be in maintenance mode.
Both are from the same company. Either is $11.62/year, with a 30 day free trial.
https://addons.thunderbird.net/en-US...change/?src=ss
https://www.beonex.com/owl/
https://addons.thunderbird.net/en-US...rvices/?src=ss
https://www.exquilla.com/index.html