Setting up Outlook add-in Before you start, ensure that you have the API Gateway file for Outlook add-in. Optionally, if you have access to API Gateway, proceed to Authorized Apps and download the API Gateway file of M3 CLM Outlook Add-in. If you have no access to API Gateway, ask for a copy of the API Gateway file from your system administrator. See how to download the API Gateway file in Infor M3 Customer LifeCycle Management Configuration Guide for Infor OS - Cloud Edition. On the Login page of Outlook Add-in and click the Folder icon. Upload the previously downloaded API Gateway file. Click Sign in and log in using your M3 CLM sign-in name and password.