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Outlook Check Names does not find a user's Logon Name

After users have switched their Outlook to cached mode, they are not longer able to look up a user's AD "logon name" in the "To..." filed of a new email and resolve the user.  This works fine when not in cached mode.  Yes, ADUC can be used, but this is preferable for some users.

We are using Exchange 2013 CAS and 2010 mailbox servers currently.  Is the AD "logon name" not part of the Offline Address Book (OAB)?  Is there some way to fix this issue?  Thanks.
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ubsoc
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ubsoc
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George SasIT EngineerCommented:
I think this issue is more likely to be caused by the servername not the username.
Check server name and make sure it resolves to your CAS.

Are you using DAG ? If yes , point the servername to the cas array name.
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ubsocAuthor Commented:
We are in a mixed 2013/2010 environment.  Mailboxes are on 2010 and use the CAS Array name already.  Users are using 2013 or 2010 (depending on IMAP or Outlook Anywhere settings).  It works when they are not using Cached Mode in Outlook.
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George SasIT EngineerCommented:
Check the Advanced tab under the profile and see if they connect trough HTTP or how do they connect to the CAS array.

Also check what they connect to when in cached mode and online mode.
Hold CTRL down , right click on the Outlook icon down in the taskbar and check "Connection Status".

Just for test, you could make a new outlook profile for a problematic user and see if a new profile works.
I guess this user profiles were created BEFORE you started the "migration" process.
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