I'd like to use a spreadsheet for my table in a mailmerge. Is this possible?

I’ve been trying to use a spreadsheet, already populated with names and addresses, to mail merge a letter. When I try to use it as a database, I get an error saying that it can[t be linked with a database. What am I missing?

Hello,

Please see my answer in this post → How do I create mailing labels from spread sheet data?.