asterisk users - Nov 2009 - Exchange 2007 and Voicemail with Imap Storage

Hey has anyone gotten Exchange 2007 working with Imap Storage?  I know  
that Exchange 2007 didn't support the usual delegated Imap access  
until Rollup 4, but it should work now right?  I have it working fine  
with Exchange 2003.  When I do DomainName\Username\mailboxalias, I get  
authentication failures on Exchange 2007 with a username of "Username 
\mailboxalias".  If I try the alternate login of "Username at Domain/ 
mailboxalias" I get an invalid remote specification from the c-client  
library.  I'm using imap2007e.  The strange thing is that both of  
those logins appear to work fine when using the php imap_open command,  
which is also built against the c-client libraries, though they appear  
to be built against the older 2001 version.

Thanks,

Ryan Wyse