Fedora directory users - Oct 2007 - Windows Sync and displayname Attribute

We are trying to populate Active Directory using Fedora Directory and Windows 
Sync.  It works great if we make sure the FD data is in a format that AD will 
accept.  There is one hitch -- we need to fill the displayname attribute in 
AD, since this will be used by our new Exchange address book.  I tried adding 
the "displayname" attribute to an FD user record, but it
doesn''t replicate to
AD, even after a full resync.  Can anyone suggest how this could be done?  
Thanks.   -Glenn.