@Jeff: "I would like to authenticate users across domains using UPN instead of UNC. 
We have successfully achieved this requirement if one of the domains is in 
Windows 2000 Native Mode. However, if both domains are in Windows 2000 mixed 
mode the DC's treat the UPN name (<email_address>) as one long username 
without any domain information. This generated a security event 529 (invalid 
username or password). Can anyone confirm that Windows 2000 AD has to be in 
Native mode to authenticate UPN across forests/domains?"
    @Ozone: "This is a limitation with mixed mode.  As soon as you go to native mode in 
all Win2K domains, you should be able to do this, but not until...
HTH
Ozone
<quote>"
{'source': 'USENET', 'other_information': '{"reply_count": 1, "forum_name": "microsoft.public.exchange2000.active.directory.integration.20140221.mbox"}', 'file': 'data/output/usenet-microsoft.public.parquet'}