Search the FileMaker Community for outlook because here has been a lot of posts/discussion re issues. For example:
Previous issues identified by FMI:
Latest updater from FMI might help:
Hope this helps
See this response: https://community.filemaker.com/message/503520#503520 from GuyStevens
It fixed the issue I was having.
Also you need to use a 64-bit version of Office if you are using 64-bit FMP.