Now you need to make sure your pages are going to get flattened. For each spread that contains text that you want converted to outlines, put a transparency object on it. If you want to convert every page, you can put this object on your master pages. For example, it could be an object with a Tint of .1% and an Opacity of .01% off on the margin that will never be seen. Or you could make a one-pixel large Photoshop file with a transparent background and place it on your pages.
When you export your PDF file, make sure you have Compatibility set to Acrobat 4, which lets you implement the flattener. You could also export each page as an EPS file if you were so inclined, which also requires flattening. Select your custom flattener setting in the Advanced pane of the Export PDF dialog box or the Export EPS dialog box. Click OK.