[While the following thread is not the letter itself, it does talk about it.]
Why Benedict XVI Is So Cautious with the Letter of the 138 Muslims
"The letter from the 138 Muslims addressed last month to Benedict XVI and to the heads of the other Christian churches received a spectacular collective reply in a message signed by 300 scholars and published in "The New York Times" on November 18."
So essentially, its contents are secret to the general public? How did these “leaders” see it?