FortiWeb - Block Device Type

[Fakruger]

Hi,

I am pretty new to FortiWeb and is struggling a bit.

I am publishing my Exchange Active Sync via FortiWeb and want to block certain "Device Type" IE-Outlook. I want to block Outlook anywhere and my problem is that although I have blocked the URL path that Out look anywhere uses it seems to use Active sync now. So in my inexperience I thought if I block the Device Type that Outlook cant connect. 

Any advice?