by my expirience is the best Mobipocket Reader fo Windows Mobile. Last version is old, but is very good working - my version is v.5.3 build 582. It's reading mobi, prc, pdb,... You can import rtf, doc, pdf, epub, etc.. by Mobipocket for PC. For yourself making mobile books you can download Mobipocket Creator. Everything is free. I use it on Windows Mobile 6.5 Professional and on Windows 8.