Hi Marie!
Sadly, I don't use Xenu anymore either. Most of the solutions to find orphaned pages are either hit-and-miss manual methods (search OSE, search your server files). Or you could use a method like Agents of Value describes here.
Couple of posts that may help:
1. Find Orphaned Pages From Your Sitemap.xml File with Excel and IIS Toolkit
Requires IIS toolkit, which unless your installing on an external machine, isn't mac friendly
Ian has some great tips here, including:
- Search the server log files for every unique URL loaded over a 6-month period. Compare that to all unique URLs found in a site crawl. People have a funny way of stumbling into pages you’ve accidentally blocked or orphaned. Chances are, blocked pages will show up in your log file, even if they’re blocked.
- Do a database export. If you’re using WordPress or another content management system, you can export a full list of every page/post on the site, as well as the URL generated. Then compare that to a site crawl.
- Run two crawls of your site using your favorite crawler. Do the first one with the default settings. Then do a second with the crawler set to ignore robots.txt and nofollow. If the second crawl has more URLs than the first, and you want 100% of your site indexed, then check your robots.txt and look for meta ROBOTS issues.
3. Supposedly, Webseo has an automated option to find orphaned files, but I haven't used it nor can I vouch for it:http://www.webseo.com/
Hope this helps! Let us know what works.