I was also wondering what "OD books" stands for on booksonboard.com, and I got this reply from their support:
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MP and OD are designations for different sources for the books. The formats themselves are identical and are the standard Mobipocket format, OD is distributed to us through a source in Cleveland, Ohio, and requires one process for PID set up. MP comes to us from Amazon/Mobipocket in Paris and requires a different process for PID setup. We went to the duplicate sourcing when Amazon's Mobipocket server went down for ten days in August, leaving our customers no way to download their Mobipocket ebooks. At that time, we exchanged many of them for OD books to keep our customers reading.
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I guess there is not much of the difference which one you buy, until one of the servers in Cleveland or Paris goes down.
