Difference between Outlook.Folder and Outlok.MAPIFolder

Question

I\'m not clear on the difference between the classes Folder and MAPIFolder in the namespace Outlook. When I review the code in the net, so

Answer 1

Folder has superseded MAPIFolder which is now deprecated. See related SO post. Folder has additional event hooks as compared to MAPIFolder

Application.Session == Application.GetNamespace("MAPI") - they are interchangeable. See related SO post.

MAPIFolder and GetNamespace() are carry overs from Outlook 2003 and below - they've just been kept for backwards compatibility. There's no way to avoid type casting with VSTO - you will constantly be boxing and unboxing.