Looks like whatever loophole let you do this in the past has been closed. Even if you add all the possible fields to your template in Excel, the import process now only imports those provided in the default import/export template (name, last name, email, telephone, mobile number, postal code). :-(
Hi Jillian! The only fields you can import are the fields in the guest list template (name, last name, email, telephone, mobile number, postal code). Once you've imported your guests you can add their addresses and other info individually in the guest list!
I was fairly certain you can do this... But you should start it at the beginning so you're not doubling up/overwriting guests. I THINK, if you add one guest and "export" the guest list, it gives you all of the possible columns of information.
If you follow those columns precisely, and add the rest of your guests into that excel sheet, you should be able to import it back in with all of your information. It looks for the column names that the program in the website knows to look for, so be careful not to change any of them (spaces, capitlization, etc). I would also just leave the unused columns blank... don't delete them, as I'm not sure if it would cause a glitch.
I'd test it with about 10 guests, and if it works, do the whole thing. I had already manually added the names of all 120 guests before I remembered about addresses, so I goofed myself on that one.