Outlook 2010 Out of Office Assistant only works when prompted for credentials

Hello,
I've come across what seems to be an odd issue with Outlook 2010 and Exchange 2010 in an SBS 2011 environment and am hoping someone has seen this issue before.
Basically, we have a few users who can only get their OOF Assistant in Outlook to work if they supply their credentials at Outlook startup. If credentials are saved, on subsequent startups, the OOF assistant
will not work, and receive the "Server is currently unavailable" commonly encountered.
OOF does work within OWA. 
Everything tests out fine as far as I can tell, but am open to providing more information as required.
Mahalo!

Hi,
Generally, this issue occurs because the CAS server uses the credentials that you used to log on to Windows instead of the credentials that you used to log on to the mailbox in Outlook 2010. Please check whether the Windows credentials do not match the mailbox
credentials in your environment.
To resolve this issue, please refer to the following KB:
http://support.microsoft.com/kb/2596516
If the issue continues, please check whether there are any event logs in local machine and CAS server. You can post it here for further analysis.
Thanks,
Winnie Liang
TechNet Community Support

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    Get-ClientAccessServer  | FL >C:\cas.txt
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