Hi Mikeshimkus,
So in the scenario above, I am connected via 3G mobile broadband outside of the network. If I use IE and connected whilst inside the network, I do not experience any issues. I am using the host file to direct my traffic to the F5 as my existing production environment is going through a Microsoft UAG and that does not give any issues.
I am running 11.6 and the latest template from the F5 site. The template version is f5.microsoft_exchange_2010_2013_cas.v1.5.0.tmpl and firmware version is BIG-IP 11.6.0 Build 5.0.429 Hotfix HF5.
Thanks