Hi Senoui, I cannot comprehend: I have exactly the same problem as you reported in another thread some time ago: http://discussion.evernote.com/topic/35243-evernote-for-windows-463-rc/?p=191196. I'm running Outlook 2013 64bit on Win7, 64bit and get the same "not a valid add in" / "runtime error" messages as you reported there. I'm running the most recent public version 5.0.1.1188 of Evernote. How did you fix it? Or anyone else? Thanks! Alex