When you click OK, the file is going to be recreated. Now that the file was recreated, you need to be able to print invoices. Preferences files for printing have a reputation for becoming corrupt. For instance, if the document is going to be printed, it must be formatted to be printed on a typical size paper. As a way to mail merge, you will need to make the most important document that has all of the information including text, graphics and other details that are the very same for all clients.