don't know if you've resolved the problem, but I stumbled on a thread on a similar subject two years ago, and your situation (undefined as it is) came to mind. Mike Legase posted this link:
http://support.microsoft.com/?id=317721

it has to do with 5.5, 2K and ADC, but there's a chance it might be echoed into your upgraded environment.

----- Original Message ----- From: "Holstrom, Don" <[EMAIL PROTECTED]>
To: "Exchange Discussions" <[email protected]>
Sent: Thursday, July 12, 2007 3:17 AM
Subject: RE: 07 authentication...


User logs on, opens Outlook, all is as it should be. Then maybe in a
couple of hours, not having logged off, when he tries to open Outlook,
it asks for his password. Isn't that authentication? Or is it some other
word?

Exchange 07, Outlook 07, Vista
Does not happen to those users on XP
Server and users updated to latest published updates
Should I contact Microsoft about this?

I was just wondering if anyone else had experienced this.


-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Chris
Scharff
Sent: Tuesday, July 10, 2007 9:24 AM
To: Exchange Discussions
Subject: RE: 07 authentication...

I've never heard of "lost authentication", what does that mean exactly?
You still haven't clarified.

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:bounce-
[EMAIL PROTECTED] On Behalf Of Holstrom, Don
Posted At: Tuesday, July 10, 2007 6:38 AM
Posted To: swynk
Conversation: 07 authentication...
Subject: RE: 07 authentication...

I just realized he is on a VISTA machine, the only difference from the
others, who are on XP. Anyone heard of lost authentication on VISTA
machines?

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
Chris
Scharff
Sent: Monday, July 09, 2007 11:32 AM
To: Exchange Discussions
Subject: RE: 07 authentication...

What does unable to connect mean? Is he getting a permissions related
rejection of connection attempt? If not, I think you have another
issue
(probably network and/or DNS).

> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:bounce-
> [EMAIL PROTECTED] On Behalf Of Holstrom, Don
> Posted At: Monday, July 09, 2007 8:19 AM
> Posted To: swynk
> Conversation: 07 authentication...
> Subject: 07 authentication...
>
> Don't know if anyone is running into this problem or not, but I
don't
> even know how to word it to search it.
>
> Running Exchange 07 over Server R2, all the updates that come
normally.
> One of my Outlook 07 clients keeps losing rights to read his e-mail.
> The
> only difference I can ascertain on his workstation from the others
is
> that he also has a POP3 account set up on Outlook, he set it up to
give
> him the option on either account when he opens Outlook, and goes
back
> and forth. At different times, not all the time, he is unable to
> connect
> to Exchange. And sometimes if he leaves his machine on overnight,
when
> he opens Outlook, it won't connect either.
>
> Never saw this problem with 03 & 03.
>


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