About Web publications
You can create two types of publications with Microsoft Publisher: print publications and Web publications. When you work on a Web publication, you work in Web mode. The options available to you in Web mode are tailored specifically to Web publications so that you can create a publication that is optimized for display in a Web browser. For this reason, certain text formatting options and other features that are specific to print publications, such as Commercial Printing Tools, are not available in Web mode.
You can always determine which publication mode you are in by looking at the title bar of your open publication, which will display either Print Publication or Web Publication, depending on the publication type.