Re: Exchange 2003 POP3 authentication failure (bug?)

On Fri, 6 Jun 2008 16:35:51 +0200, "Massimo" <barone@xxxxxxxxx> wrote:

"Andy David {MVP}" <adavid@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> ha scritto nel
messaggio news:7s6i44l262d3v9r99pm1ptf8h89esvhu4e@xxxxxxxxxx

By the way, I still can't understand why Exchange have trouble looking up
users when authenticating with the DOMAIN\username format. If a user
authenticates this way, there can't be any possibile doubt on who he is,
even if duplicated usernames exist in multiple domains. So, why can
Exchange
look up users (and mailboxes) when logging on with the UPN but not when
using the DOMAIN\username syntax?

The explicit logon is required when logging on using the down-level
format simply because Exch doesnt assume that the mailbox alias
matches the username alias.

Ok, but since Exchange can univocally identify the user, couldn't it just
read the mailNickname property from the corresponding Active Directory
object? I really can't find any good reason to not do that...

<shrug>
That's just he way its logic works. If the mailbox alias doesnt match
the username, it doesnt like it.

UPNs are unique by design, so the server knows there will be never be
a duplicate.

DOMAIN\username logons are unique by design just like UPNs.

But obvisously they arent treated the same.





Massimo
.

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