bOOT-CoDe

I have the same problems with Thnderbird 52.0, Lightning 5.4, Exchange EWS Provider 3.9.0. @Mechtilde: you can download new version of Thunderbird [here](https://download.mozilla.org/?product=thunderbird-52.0-SSL&os=win&lang=en-US) (the official site). bOOT