4.1 Opening a Special Folder
Get the value of the PidTagIpmAppointmentEntryId property (section 2.2.3) from the Inbox folder object returned in step 1 by using the Property and Stream Object Protocol, as described in [MS-OXCPRPT]. This operation returns an entry ID for the Calendar folder.
Convert the entry ID returned in step 2 to a FID, as specified in section 2.2.2, and then open this folder by using this FID and the Folder Object Protocol. This operation returns a Folder object for the Calendar folder.