I now have a Mybook live where Itunes from both mac and PC runs OK to Itunes server in HDD. However it took about 7 days for Itunes server to publish Itunes 10 music files.
My Mybookworld just spins and spins when trying to connect.
I contacted WD and got this response.
We sincerely apologize for the inconvenience, we will be more than glad to assist you with this issue. Please keep in mind that in order for you to use the iTunes server on your My Book Live you must use the iTunes version 10.2 or earlier, please see the links below for more information:
iTunes server and how it works on a WD Network drive
Videos and music stored on a My Book Live, My Book Live Duo, My Book World, WD TV Live Hub or WD ShareSpace cannot be streamed through iTunes