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Thunderbird Adds Native Microsoft Exchange Email Support - The Thunderbird Blog
(blog.thunderbird.net)
this post was submitted on 19 Nov 2025
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I'm glad they have it but adding EWS support at the end of 2025 is nothing to brag about. EWS came with Exchange 2007, almost 20 years ago!
Yeah but it looks like this includes support for organization Office 365 accounts, so it's not just something that only worked 20 years ago. If it only supported outdated Exchange servers that would be one thing, but it seems to support modern ones.
Microsoft announced a while back that the end of EWS is coming for exchange online which means M365 accounts. They will start blocking EWS requests from October next year and only support access via Graph API. I understand the Thunderbird team are also working on Graph API support.
EWS EOL