Microsoft: "PDF is a great solution where you need to ensure that a document will faithfully reproduce when printed to a fixed page size. In the future, though, one of the key consumer benefits of e-books will be the ability for content to dynamically reflow across multiple devices -- allowing consumers to move their e-books from a laptop to the Pocket PC and back again, as just one example, or from a purpose-built reading device to a PC.
Two Roads Diverged
Microsoft: "PDF is a great solution where you need to ensure that a document will faithfully reproduce when printed to a fixed page size. In the future, though, one of the key consumer benefits of e-books will be the ability for content to dynamically reflow across multiple devices -- allowing consumers to move their e-books from a laptop to the Pocket PC and back again, as just one example, or from a purpose-built reading device to a PC.