Office2007 has started to use the SEC_RIGHT_SYSTEM_SECURITY bit in open. We don't support this and must reply NT_STATUS_PRIVILEGE_NOT_HELD in order for the client to correctly retry. Capture trace showing this to follow.
Created attachment 3970 [details]
Wireshark trace between XP and Windows server using office2007.
See packets 531 and 532 for details.
Created attachment 3974 [details]
Patch for 3.3.1 and above.
Fixes the problem (confirmed).
Confirmed fixed by reporters "Michele Petrazzo - Unipex srl <email@example.com>" and "Schweigert, Udo CERT" <Udo.Schweigert@siemens.com>