The Bebook can be used to read Mobipocket format ebooks by downloading the appropriate version of the reading software from Mobipocket.
Once the software has been installed you will need to ensure that you have registered the Mobipocket PID for the device prior to downloading your purchases.
Here's where you can find your PID:
You can then log in to your eBooks.com account and download your Mobipocket format book to read on your Bebook.
You can also read unprotected PDF and EPUB files using the Bebook. These file types can be read by simply transferring them to the reader you normally use for accessing PDFs.
For further help with the Bebook, please click here.