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Multiple/repeated system Lock Outs after Exchange 2010 Upgrade

Posted on 2011-03-09
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Last Modified: 2012-05-11
We've had a relatively problem free transition to Exchange 2010 but we're trying to work our way through the last of two troublesome issues.  At first, a handful (5 or so) of our Outlook users were seeing multiple log in requests throughout the day after opening Outlook in particular.  This is was often times associated with an eventual locked out account.  

Currently, we've worked through to the point where we're seeing single authentication requests when ever anyone opens Outlook. For most, they enter in their password and all is well for the rest of the day.  For several, they enter in their password and they're immediately locked out - sometimes with repeat occurrences same day.

The recurring level problem seems to affect people with combinations of multiple devices most.

We've been working with Microsoft and they have been focused on Outlook KB2412171 which they've said was fixed - http://support.microsoft.com/kb/2475891 (Description of the Office Outlook 2007 hotfix package (Outlook-x-none.msp): February 22, 2011).  Initial solution protocol called for the removal of said article with a remapping of Outlook through auto-sync discovery.  However, it was discovered yesterday that Outlook KB2412171 re-installs itself automatically. So the next suggestion to prevent this was to turn off auto-updates entirely.  While the removal of Outlook KB2412171 with auto-update disabling has reduced the frequency of these occurrences they are still happening for at least several people in particular on staff.

Our Microsoft tech mentioned yesterday that authentications when opening Outlook is a "feature" of Exchange 2010 - which is fine but I'd like to confirm that PLUS - how to turn it off if the decision is made to do that.

More so, I'm wondering if anyone has seen or heard of this issue and if so, how can we fix it.  Thanks.
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Question by:LTWadmin
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e_aravind earned 500 total points
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Check if the below KB can be applied on your servers:

FIX: You receive the error message "HTTP Error 401.1 - Unauthorized" sooner than expected when you try to log on to an IIS 7.0 Web site by using invalid credentials
http://support.microsoft.com/kb/981280

>> from OL2k7 onwards Outlook needs to communicate to the IIS server to get the autodiscover,EWS, OAB files\details\objectes.
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by:LTWadmin
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I have to close this abandoned question which is being graded for responding only.  Accuracy cannot be determined since (at this time) I'm not even sure Microsoft has their arms wrapped around the problem.
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