If you could use perhaps Photoshop if you have it to remove the color.
Or a Graphics Program I love to use GraphicConverter It has a setting in which you can remove color. you can save in any Graphic Format and PDF as well. Cost about $70.00 but once you buy it incremenatl versions are free and major upgrades are dirt cheap.
Distill to a PDF, then in Acrobat go to tools> Print Production>convert colors> Device gray: Convert> Profile: grey gamma 2.2> don't embed profile.
Use advanced> output preview to toggle the black separation on and off to confirm the file is black only.
Go to File
Change printer to Adobe PDF
Go to the properties tab
Find the button to click to change it to Black/white, and click it
Print the document - it will ask for a file name, so give it something different from the original or you will overwrite the original
Open the new document if it doesn't open automatically.
It doesn't always handle images well, and is truly black and white, but hey, it sure saves on printer cartridges!
Thank you. Luke's process (post #5) worked, but the resulting document is larger than my color file. I am trying to reduce the size of my file, is converting to Black and White not a helpful way to do this?
If not, under the Advanced Menu is PDF Optimizer where you have different settings to reduce the file size.
Be careful not to sacrifice quality of the file just to stuff it small enough to email. If you can't make it small enough, there are many FTP options you can look into.
Thanks for the quick responses.
Save as gave me exactly the same file size -- still almost 50% bigger than the color file. Any idea why the greyscale (I didn't do BW, I did greyscale) file would be larger than the color file?
Though you are asking about Acrobat 7.0, this post describes how to do this very well in Acrobat 9 Pro. Maybe older versions are supported as well.
For any new searchers, the easy option whilst preserving meta-data (re-frying through PS destroys meta-data) is:
-Acro 9 and previous I think it was under menu Advanced : Preflight
-Acro X and later, go to the Tool section, and look for Print Production section, then Preflight
Under the PDF fixups, you should have Convert to Grayscale
This should force save a new copy, so your original remains untouched.
Preflight has a number of other useful compatibility tools and stuff to clean up your PDFs' binary, I highly recommend investigating this area :-)