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Thunderbird Adds Native Microsoft Exchange Email Support - The Thunderbird Blog
(blog.thunderbird.net)
This is a most excellent place for technology news and articles.
Great! We can get (almost) a whole year of using it with Exchange Online before EWS is turned off!
They've said that this is a big stepping stone towards support for Microsoft's graph api and lots of on-prem servers will still be using EWS for ages to come.