Add the following to the [Microsoft Exchange Server] section of the OProfile.ini:
RPCoverHTTPflags=PT_LONG,0x6623
RPCProxyServer=PT_UNICODE,0x6622
RPCProxyPrincipalName=PT_UNICODE,0x6625
RPCProxyAuthScheme=PT_LONG,0x6627
CachedExchangeConfigFlags=PT_LONG,0x6629

Then add the following to the [Service2] section:
RPCoverHTTPflags=11
RPCProxyServer=https://myproxy.imanami.com
;RPCProxyPrincipalName=
RPCProxyAuthScheme=1

More information:
RPCoverHTTPflags
Bitwise value, add up all these options:
 Connect to my Exchange mailbox using HTTP corresponds to:
+1 when checked
+0 when unchecked

Connect using SSL only corresponds to:
+2 when checked
+0 when unchecked

Mutually authenticate the session when connecting with SSL corresponds to:
+4 when checked
+0 when unchecked

On fast networks, connect using HTTP first, then connect using TCP/IP corresponds to:
+8 when checked
+0 when unchecked

On slow networks, connect using HTTP first, then connect using TCP/IP corresponds to:
+32 when checked
+0 when unchecked


RPCProxyServer
Use this URL to connect to my proxy server for Exchange"


RPCProxyPrincipalName
Principal name for proxy server 


RPCProxyAuthScheme
1 = Basic
2 = NTLM
