All, here is the overview of my issue
I have recently installed Hybrid CAS for my client using Exchange 2010 SP3. We have on-premise email accounts configured and we have O365 based online accounts configured. Free busy is working / autodiscover is fine and mailbox migrations are enabled and working fine. Our company uses an MDM solution that has a ISAPI filter that is part of the on-premise ActiveSync publishing rule. Devices configured by MDM use the current on-premise ActiveSync rule going to email.company.com
The issue is that devices configured with O365 based email accounts go direct using outlook.office365.com, they do not go through the on-premise TMG ActiveSync rule
Here is my question:
Does the autodiscover service work as the Activesync rule as well? Can i configure autodiscover.company.com as part of the ActisYnc publishing rule on TMG and have both on-premise and online accounts get directed through TMG - and thus through the ISAPI filter before the on-premise CAS servers respond back to the device mail request and online accounts gets redirected to the online ActiveSync service?