harmon.ie can access SharePoint sites using basic authentication, forms authentication, NTLM authentication and Kerberos authentication. For custom authentication methods, contact support@harmon.ie.
There are three configuration requirements for accessing a SharePoint Server from Outlook:
harmon.ie uses the Windows SharePoint Services Web Services to connect to a SharePoint site. You can verify they are accessible by visiting http://<SharePoint Server>/_vti_bin/sites.asmx.
The M365 administrator needs to grant Browse Directories permission for users to view subsites:
Client integration is disabled by default when you use forms-based authentication, because client integration does not support forms-based authentication natively. To enable client integration:
For more information, read How to create and edit Permission Levels.