Initial commit.

Wino.Core.Domain/Models/MailItem/IMailItemThread.cs

@@ -0,0 +1,16 @@
+using System.Collections.ObjectModel;
+
+namespace Wino.Core.Domain.Models.MailItem
+{
+    /// <summary>
+    /// Interface that represents conversation threads.
+    /// Even though this type has 1 single UI representation most of the time,
+    /// it can contain multiple IMailItem.
+    /// </summary>
+    public interface IMailItemThread : IMailItem
+    {
+        ObservableCollection<IMailItem> ThreadItems { get; }
+        IMailItem LatestMailItem { get; }
+        IMailItem FirstMailItem { get; }
+    }
+}