In the French edition (Pocket) of The Rise of Endymion, written by Dan Simmons, the acknowledgements section refers to Jeff Orr with the following (my translation):
Jeff Orr, extraordinaire cybercowboy, for recovering from cyber-space forty pages of this story, kidnapped by the TechnoCore;
The book has been written (published?) in 1997. I am not at all familiar with how writers used to write at that time, but could it be that Dan Simmons lost some pages of this story on a computer/Internet and Jeff Orr got it back for him?