I've upgraded to El Capitan and also to Office for Mac 2011 ver 14.5.8. Outlook was not performing well after the OS upgrade, which is why I went to 14.5.8. As I tried Mail Merge for the first time since the upgrades, it can’t find my Office address book: “Word could not merge the main document with the data source because the data records were empty or no data records matched your query options.”

Outlook clearly shows all my contacts under the header Address Book, so I can’t figure out why Mail Merge can’t find the contacts. I had to rebuild Outlook several times after the upgrades, so I’m not sure if this is the problem.