Calamity Jane wrote:
something called "Content Streams" uses nearly 99% of the document.
That's bad news -- content streams is what you suspect, your document's actual contents, the text and the tables. So you have no easy options, such as re-sampling images or fixing fonts.
This is not going to help you, but, just for my satisfaction, I ran a few quick tests.
Word .docx document: ~1441 pages, ~3MB compressed, ~30MB uncompressed (text and tables, no images)
Win Word 2007 → PDF (using Acrobat 8 PDF Maker): ~4.2MB
Mac Word 2008 → PDF (using Quartz): ~11MB initial, ~7MB after size reduction
Mac Word 2008 → PDF (using Acrobat 9): ~19MB initial, ~7MB after size reduction
Mac Word 2008 → PostScript (using Quartz): ~267MB → PDF (using Distiller 9): ~6MB.
This is in no way definitive, just a quick-and-dirty run, and there are lots of different options and settings which are involved. But it does suggest a problem. Whether it's Mac OS X's treatment of PDF, or that the Mac Word print function is not as efficient as Win Word's, I don't know. Other than Office, I don't use the same apps on Mac and PC, so I can't test it. I understand that PDF Maker (Win) is specifically optimised for MS Office docs, which is not the case with Acrobat Mac settings or workflows; maybe this explains it.
At any rate, it seems to me that, at this point, if you want to squeeze your MS Office PDFs to the lowest size, you'd better do it on a PC, unless you can find another Mac app to do the job. Or perhaps someone cleverer than myself can figure a way of tweaking the settings to get what you want.
Good luck.