Sometimes when you use the PowerPoint template provided on the corporate design page, changes that you make within the footer in the master view are not transferred to existing pages, but appear on newly added slides.

You can work around this problem by deactivating the footer under the “Insert > Header and footer” tab, then entering your changes (either in the master view or in the “Header and footer” dialog box) and then reactivating it. Confirm your entry with “Apply to all.” PowerPoint then interprets all footers as newly created and applies the changes you made to all existing slides.