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. 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.