ACT 16 sync outlook: cannot choose contacts or activities

[sidtech]

Hello, my name is Kathleen. 

My Collegues wants to use outlook for calender activities and contacts. i have activate the outlook sync at two Computers and it works perfect. The Third one dont let me choose activitys or contacts for the syncronisation options.  I have no idea how to solve that problem. Can Anyone help?

Thanks a lot.

Kathleen