Inbound SSL inspection breaks part of Outlook Web App search.

Hi

We have a Fortigate 200E running FortiOS 6.0.11 and we use inbound SSL inspection on incoming port 443 traffic to our Exchange server providing Outlook Web App functionality, we use a domain wildcard certificate on the Fortigate and a named certificate on the Exchange server in the same domain as the wildcard.

This generally works well but the one problem we have is that with inspection enabled on the Fortigate when users search in the outlook web app the "Get More Results" link that should appear after the initial 25 results are returned does not. 

Anyone encountered and resolved the problem?