Форум поддержки Thunderbird

I see that I can save an ics file from an email or website and import it from within thunderbird. I want thunderbird to be my default calendar app, so I can just click on / open an ICS file and it does so in Thunderbird, NOT Outlook. I don't even see a way to uninstall outlook without having to uninstall office altogether (not a viable solution).

Is it possible to do this in Thunderbird?

I need a recurring calendar event for the "n"th specific day of the month. Outlook (that I used to use) could do this. I can't see the new event dialog box offering this option.

Using the powerful TB Lighning a lot, i am coming across one problem regurlarly: When copy-pasting a calendar-event, i have to choose in which calendar it should be saved. This is really annoying when copying more than a few entries. So my question: Is there any chance to disable calendar-selection dialog on copy-paste?

(in my imagination it would be enough to save in the currently selected calendar feed..)

Thank you for any hints, P.