In my case my client has confirmed they have the 64 bits version of office and the autodesk 64-bits, however the free-busy on the outlook app (not OWA) does not show, we do not think it is the Microsoft office which is failing as if you remove inventor's 64 bit access database engine fixes the issue within outlook but breaks functionality with inventor, need to inform my client if they can open a case with you guys and investigate since we do not have access to Autodesk inventor code since it would be a third party tool, and it is shown that the app is the one breaking the free-busy when installed on outlook