In exchange connector, supported authentication mechanims dialog
appears only in the account editor and not in the account set up druid.

Exchange plugin finds the auth mechanism supported by the server and
sets it in the account URI automatically when the account is configured.

Supported auth mechanisms, in the editor has 2 values, 
"Secure password" and "plain text password", and auth property
corresponding them are auth=NTLM and auth=Basic.

When account editor is invoked, emae_receive_page() forms the url
from the editor dialog and it doesn't set auth=NTLM, if the 
auth mechanism is set to "secure password", and the account URI created will
have no auth property set and gconf will have the wrong URI.

with this, if the editor is opened, subscequent folder operations will fails,
as the folder URLs in the hash table and in the gconf doesn't match.
Also if server supports only NTLM, any operation would fail.