Did an test with an fresh deployed thunderbird, the calendar looks like this
http://abload.de/image.php?img=lightningjws9y.jpg Now I went intoC:\Program Files(x86)\Mozilla Thunderbird\distribution\bundles\[email protected]\chrome\content
And removed everything at first then i copied the original content of C:\Program Files(x86)\Mozilla Thunderbird\distribution\bundles\[email protected] into that folder and then no more greyed out fields.
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