Logging a user out of ADFS when logging out of APM

Richard,

Can I ask you why have you setup Exchange for ADFS authentication? I've not seen that done before, so curious as to what drives this design. Also, I am a bit surprised that Exchange is not invalidating the auth cookies upon logging user out - else you can do an iRule redirect when doing Exchange logoff to send you to the ADFS logout page that should help invalidate/erase those cookies.