Hi, I have implemented RPC/HTTPS in my org. However, we are awaiting necessary approvals from the security team to open the ports on firewall to test the access. Meanwhile, I tried testing it on LAN, but by default Outlook connects using TCPIP (MAPI) over LAN. I tried the below option but it didnt help. HKCU\Software\Microsoft\Office\11.0\Outlook \RPC where you create a REG_DWORD value called DisableRpcTcpFallBack that you set at 1. Please let me know if there are any other methods to force Outlook to use RPC over HTTPS on LAN. Else please suggest an alternate method to test the RPC over HTTPS over LAN (I have already tried http://technet.microsoft.com/en-us/library/bb124649.aspx& found to be good.) Thanks in advance