Several months ago I stumbled into an issue. I had OData data source with events and had to connect it to Outlook. Usually, it is a very simple task to map a content type to Office Item Type using SPD. However, for a while, SPD can’t work with OData at all. So, it was impossible to use common tool for that.
After three days of unsuccessful googling and asking how to achieve it everywhere 🙂 I tried to investigate it myself and found a way to do it!