With version 4.64 you have the possibility to set up for each service activity a specific color. GroupCalendar setup will create automatically a picklist attribute on the service activity entity which is used for this feature. To activate color-coding for service activities, you have to add this attribute to the main form of the entity. The attribute is named ptm_colorcode with the display name Color and is predefined with 12 colors.

The problem occurs because MS CRM is using an HttpModule for multitenancy scenarios. This http module is called with an anonymous user account. This is why it fails when trying to request, i.e. the metadata webservice.

Please note: Requires GC v4.61 or higher

There are four settings in the GC settings named

• GanttColorAppointment1: Color 1 for specified appointment status codes
• GanttColorAppointment2: Color 2 for specified appointment status codes
• GanttColorServiceApp1: Color 1 for specified serviceappoinmtent status codes
• GanttColorServiceApp2: Color 2 for specified serviceappointment status codes