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8 days agoMicrosoft 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.
On the web UI they sneakily slide in the Gemini icon exactly where the settings icon is after about 2 seconds of loading the page which caught me out for the first account I was updating. Really annoying.