Creating Outlook 2010 Add in for 64bit

does anyone know if there is a guide to creating an outlook add in for office 2010 that runs in 64bit mode?

I have an add in that DOES work on in Outlook 2010 32bit but it doesn't appear in 64bit - in the add in section its set to disabled.开发者_运维知识库

I have tried to compile under different target CPU's but that hasn't helped..

This: Link has a section on 32\64 bit compatibility.