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KBAlertz.com: Office Outlook 2003 does not connect to two or more additional mailboxes in a mixed Exchange Server 2007 and Exchange Server 2010 environment

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Microsoft Knowledge Base Article

This article contents is Microsoft Copyrighted material.
©2005-©2007 Microsoft Corporation. All rights reserved. Terms of Use | Trademarks




Article ID: 978777 - Last Review: January 27, 2010 - Revision: 1.0

Office Outlook 2003 does not connect to two or more additional mailboxes in a mixed Exchange Server 2007 and Exchange Server 2010 environment

SYMPTOMS

Consider the following scenario:
  • In a mixed Microsoft Exchange Server 2007 and Microsoft Exchange Server 2010 environment, you configure your user profile in Microsoft Office Outlook 2003 to access your primary mailbox.
  • Your primary mailbox is hosted on an Exchange Server 2007 Service Pack 2 (SP2) server.
  • There are additional mailboxes that are hosted on an Exchange Server 2010 server.
  • You try to access two or more additional mailboxes at the same time by using Office Outlook 2003.
In this scenario, the additional mailboxes cannot be accessed. Additionally, you receive the following error message when you send an e-mail message by using Outlook 2003:
Task 'Microsoft Exchange Server - Sending' reported error (0x800C8100): 'Unknown Error 0x800c8100'

CAUSE

The issue that is described in the "Symptoms" section occurs when your primary mailbox is hosted on an Exchange Server 2007 Service Pack 2 (SP2) server.

RESOLUTION

To resolve this problem, install the following update rollup:
972076  (http://kbalertz.com/Feedback.aspx?kbNumber=972076/ ) Description of Update Rollup 2 for Exchange Server 2007 Service Pack 2

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

APPLIES TO
  • Microsoft Office Outlook 2003
  • Microsoft Exchange Server 2007 Enterprise Edition
  • Microsoft Exchange Server 2007 Standard Edition
  • Microsoft Exchange Server 2010 Beta, when used with:
    • Microsoft Exchange Server 2010 Enterprise
    • Microsoft Exchange Server 2010 Standard
Keywords: 
kbexpertiseinter kbprb kbtshoot KB978777
       

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