You have to edit the connectors.xlm file to enable outlook support on 2.1. Plus:
Self-Signed Certificates: If your server is using self-signed certificates (not signed by a trusted
CA), users might experience frequent warning messages. If you have enabled your GroupWise
Mobility server to support the Microsoft Outlook app (see Section 2.1, “Enabling Microsoft
Outlook Support in GroupWise Mobility Service,” on page 1), the server must be configured to
use a trusted certificate. If you use the self-signed certificate that GroupWise Mobility Service
generates, the Outlook app will not be able to connect.