Thanks Svetlozar, I've used the resources to create something like the following:
Microsoft.Office.Interop.Outlook.Application app = new Microsoft.Office.Interop.Outlook.Application();
var item = app.Session.OpenSharedItem("C:\\test.msg") as Microsoft.Office.Interop.Outlook.MailItem;
string body = item.HTMLBody;
int att = item.Attachments.Count;
It may be useful to others looking for a quickstart as I was.