You cannot send a message to all members of a distribution list in Outlook 2003

In Microsoft Office Outlook 2003, you create a new distribution list that includes some Microsoft Dynamics CRM client address book provider entries. When you try to send an e-mail message to the distribution list, you cannot send the message to any CRM client address book provider entries that were deleted. Outlook 2003 does not verify the addresses before the message is sent. Therefore, these addresses are returned as unknown.

How to obtain the hotfix

This issue is fixed in the Outlook 2003 Hotfix Package that was released on December 5, 2007. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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