Hi Terence,
My kindle arrived today (yay), I downloaded Calibre to convert my current epub books that I have not yet read. But when I tried to convert from epub to mobi I got this error:
Could not convert book 1 of 1 (book name)
It is a DRMed book. You must first remove the DRM using third party tool.
Would be interested how you managed it.
Cheers
Darren