Article ID: 2596516 - View products that this article applies to.
Consider the following scenario:
In this situation, you receive the following error message:
Your Out of Office settings cannot be displayed, because the server is currently unavailable. Try again later.
Note You do not receive this error message in either of the following scenarios:
This problem 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. Because the Windows credentials do not match the mailbox credentials, the CAS server returns a "500" error code. However, the "500" error code is not an authentication error code. Therefore, no other authentication methods are tried.
To resolve this issue, apply the following update:
(http://support.microsoft.com/kb/2584053/ )Description of the Outlook 2010 hotfix package (x86 Outlook-x-none.msp; x64 Outlook-x-none.msp): August 30, 2011
Registry key informationImportant This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756After you apply the hotfix package, follow these steps to enable the hotfix:
(http://support.microsoft.com/kb/322756/ )How to back up and restore the registry in Windows
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.