samba - May 2013 - WERR_GENERAL_FAILURE joining Samba4 to Win 2k3 domain with Exchange 2007

Hello,
????I am having a problem joining a Debian/Samba4 machine as a DC to a Windows
2003 level AD domain. The domain has Exchange Server 2007 schema extensions wiht
a single Exchange Server which is also the domain controller.
?
?I ran the domian join with debug level 10 set, here is what I see:
...
???? a:<GUID=redacted>;CN=owa (Default Web Site),
?CN=HTTP,CN=Protocols,CN=servername,CN=Servers,CN=Exchange Administrative Group
(
?FYDIBOHF23SPDLT),CN=Administrative Groups,CN=First Organization,CN=Microsoft 
?Exchange,CN=Services,CN=Configuration,DC=jaydcarter,DC=com,DC=local
msExchOWATranscodingMimeTypes: S:52:????????????????????????????????????????? 
????????? a:<GUID=redacted>;CN=owa (Default Web Si
?te),CN=HTTP,CN=Protocols,CN=servername,CN=Servers,CN=Exchange Administrative
Gro
?up (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=First Organization,CN=Micros
?oft Exchange,CN=Services,CN=Configuration,DC=jaydcarter,DC=com,DC=local
msExchOWATranscodingMimeTypes: S:58:????????????????????????????????????????? 
??????????????? a:<GUID=redacted>;CN=owa (Default 
?Web Site),CN=HTTP,CN=Protocols,CN=servername,CN=Servers,CN=Exchange
Administrati
?ve Group (FYDIBOHF23SPDLT),CN=Administrative Groups,CN=First
Organization,CN?Microsoft
Exchange,CN=Services,CN=Configuration,DC=jaydcarter,DC=com,DC=local
msExchOWATranscodingFlags: 1
msExchVersion: 4535486012416
../source4/dsdb/samdb/ldb_modules/linked_attributes.c:164: Failed to find GUID
for dn (null)
replmd_op_callback failure. Error is: Invalid DN syntax
Failed to apply records: Failed to find GUID for (null): Invalid DN syntax
Failed to commit objects: WERR_GENERAL_FAILURE
Join failed - cleaning up
...
?
If I am reading the log correctly, msExchVersion is the last directory element
that was successfully?loaded; what I need to know is the next element which
apparently fails - there are about 15 elements remaining inside the 'owa
(Default Web Site)' cn ?tha have not been imported so I can't tell
exactly which one is failing.
?
I have found several references to the WERR_GENERAL_FAILURE occurring with
Exchange Server in the schema, but nothing that points to a solution.
?
Samba is version 4.0.5, running on Linux core 3.2.0-4-amd64 #1 SMP Debian
3.2.35-2 x86_64 GNU/Linux
?
Any ideas or suggestions appreciated!
?
Thanks,
Jay D. Carter