Ever since Office 2k7, there have been newer file formats such as the XML version of the current Office file formats which are the file extensions as we already know of but with the letter x added at the end to call them the new file formats for Office 2k7 but with Office 15, there are newer compatibilities for other file formats as well like editing PDF files directly in new Microsoft Word 15. But before Office 15 existed with such compatibility, there are other PDF EDITOR software that allow you to do so in case Adobe Reader itself is not enough. However, there are some flaws in Microsoft Word 15 Customer Preview. First, you cannot update the existing PDF files you've edited, perhaps some things are not compatible with the PDF reader software as one of the assumed reasons but instead, you have to save the edited PDF file under the new PDF file or the new file in other format. Hell, in Office 2k7 and above, you can export your documents to PDF file format although I had never attempted such an opportunity like that before before Office 15 existed with improved opportunity and ability for you to amend the existing PDF files.
Lastly, there will be more file format compatbilities for Office 15 as well as newer functionalities for various Office programs. Amend the PDF files as you like in Word 15 but then, Microsoft Word is supposed to be the word processing software. Yes, there are hidden capabilities of Office programs but I guess that we're already figuring out ourselves.
