F5 Big IP

Anyone have experience with using F5 as a OWA/activesync proxy? I have it working with a custom logon page with our company logo but the custom page only comes up on OWA. In activesync it shows the default F5 logo. also, on OWA users are prompted for a password only once but activesync they get the custom logon screen as well as the default exchange owa logon screen. Any advice?

I don't, but would F5 support be a better place to start? Or do you not have a contract or not one supporting config management?