You should install FileMaker 14, the 64 bit version for Windows.
This is 32 bit Filemaker not talking to the 64 bit Outlook. I have overcome this problem by installing the 32 bit version of MS Office.
I would be wary of doing anything with Filemaker 14 as the moment as people seem to be having similar problems.
The 64 bit version of FileMaker 14 will not talk to the 32 bit version of Outlook I have installed so it will work with Filemaker 13.
I have seen reports of 64 bit Filemaker not working with 64 bit Outlook so I am not inclined to spend time installing 64 bit outlook until we see further clarification from Filemaker..
However 32 bit outlook should solve your current problem.
PO Box 1542 Armidale NSW 2350
Mobile Phone: 0429 428 700
Home Office Phone: (02) 6772 3933
COAMAS - Community Options, Advocacy, Management and Accounting Software