Thanks for your comments and questions about PDF—I appreciate hearing about how you are using PDF today and what solutions would work for you. I’ve answered a few posted questions below (if you’ve been reading Brian's blog, you’ll have seen most of these but I wanted to reiterate and update them here), and I’ll post more over the next few weeks.
Is this a one-way publish only, or do we support opening and editing PDFs as well?
Save as PDF is a one-way "publish" operation only. We are neither shipping a special viewer nor doing any work to make PDF files readable or editable by the Office applications.
Why is this built directly into Office as opposed to a print driver available to all applications?
Because this functionality is native to Office applications, we can capture richer document data further upstream than we would be able to do with a print driver. For example, we annotate our PDF output with tags for accessibility and we support internal and external hyperlinks. An additional advantage to capturing document data further upstream is that we render some visual effects, such as transparency and gradients, better because we are working with native information that has not been converted to bitmap for printer output.
Do we support tagged PDF (for accessibility)?
Yes, Office PDF output contains tags to assist with reading order for screen readers, and alternative text on images and on rasterized (bitmapped) text (to avoid interrupted text flow when portions of a text run are rasterized due to text effects or other document constructions). We also tag documents and, in some cases, text runs with language tags to assist with accurate pronunciation, and we export Unicode text for nonstandard glyphs to enable screen readers to access the actual text content. I appreciate the feedback we have received in this area as to what tags people would like to see implemented.
What choices were made with font embedding/subsetting/outlining?
For our Standard intent, we both embed and subset embeddable fonts (when permitted). For our Minimum Size intent, we do not embed "Web safe" fonts, but we do embed and subset all other embeddable fonts. We are not doing font outlining in the general case.
Do you support automatic bookmarking?
Yes, document structure is implemented for some applications to support bookmark navigation in PDF viewers. In Word, for example, you have the option to generate bookmarks by page, by heading, or by Word bookmarks.