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I have been working on this problem for months on end. I reached a point where I returned to Outlook as this problem was killing my planning capabilities.
Last night I found the problem. A bunch of completed tasks imported from Microsoft To Do. How they have appeared in Thunderbird only Billy Gates know...
As soon as I deleted those tasks all problems disappeared.

Ta opinia jest o wcześniejszej wersji dodatku (3.0.2).  Ten użytkownik wystawił dla tego dodatku także inną opinię.