I found the following which may be of interest. I tired the instructions and it does cause "DEVICE" and "SEND TO DEVICE" to display in the toolbar. However, it does not properly display titles on my Nook nor does it allow to add or delete books from the Nook. Maybe it will help someone else.
Kovid Goyal (kovid) wrote on 2015-10-04: Re: calibre bug 1502610 #1
You are sufferring from the curse of the windows 10 upgrade, it causes
windows to not report the Kindle as a removable drive. The only
known solution is to do a clean install of windows 10. If you dont want
to do that, you can workaround the problem by using the connect to
folder function in calibre (click the connect/share button and choose
the documents folder on your kindle).
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