I use a tablet pc and Adobe Acrobat Pro to read, highlight passages and mark my ebooks. I don't believe this functionality is available in Digital Editions is it? If this is the case, this is a real problem. It makes no sense to me why Adobe would do this when ebooks, and ebook technology such as Kindle, Sony etc are starting to gain traction. It also means my investment in terms of time and money in PDF ebooks is undermined. Am I misunderstanding something? Is there a way to regain the functionality of Acrobat for reading and marking up ebook?