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Tunderbird does not sends a response message when accepting a calendar indication and clicking on "send response now"

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Thunderbird does not seems to send a response message with "Accepted" or "Not"or "MayBe" When acting on an invitation mail using outlook365 account. The invitation however is correctly processed by lightning plungin.

(see image)

Thunderbird does not seems to send a response message with "Accepted" or "Not"or "MayBe" When acting on an invitation mail using outlook365 account. The invitation however is correctly processed by lightning plungin. (see image)

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Here the image

Modified by ilbassodigenova