Unfortunately configuring an email disclaimer to be automatically added by the server to the footer of all emails is not possible with the Small Business Premium edition of Office 365. Certainly possible and easily configured with the Enterprise editions of Office 365 but not with the small business edition. Work around is to configure your Outlook signature block. How do you get everyone in your organisation to use the same text? Copy the text as html, save it in a shared location and then manually configure. Not pretty but effective.