Re-creating an EPUB to mobi from scratch requires quite a bit of work, but is actually simpler if you start from a text document (Word or OO Writer export to html). If you just want to read an epub on a Kindle, the kindle will do a simple conversion, as will Mobipocket reader software. Mobipocket reader creates a .prc version in its library when it does the conversion. Check out
http://www.amazon.com/gp/feature.htm...cId=1000426311
to download Kindle for PC software. It comes with sample material and publishing guidelines.
Google to find Mobipocket Creator and Mobipocket Reader software or browse the Amazon website.
Tony