The Microsoft Outlook Free/Busy Lookup option is not supported for users who access Calendar Server in SSL mode. To use both SSL and non-SSL mode for the same Calendar Server instance, users must specify different port numbers, as follows:
SSL Mode — To access Calendar Server using SSL, use the SSL port. The default port number is “443” and is set in the ics.conf file by this parameter:
service.http.ssl.port = "443"
Non-SSL Mode — To use the Outlook Free/Busy Lookup option, access Calendar Server using the regular HTTP port. The default port number is “80” and is set in the ics.conf file by this parameter:
service.http.port = "80"
For information about SSL, refer to Chapter 8, Configuring SSL, in Sun Java System Calendar Server 6 2005Q4 Administration Guide.