You open the Microsoft Dynamics CRM 4.0 client for Microsoft Office Outlook. If Outlook does not use the cached Exchange mode, e-mail messages are not sent from Outlook Web Access (OWA), from Outlook Mobile Access (OMA), or from Outlook Rules.
This problem is fixed in the latest cumulative update rollup for Microsoft Dynamics CRM 4.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
949256 Microsoft Dynamics CRM 4.0 updates and hotfixes
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
887283 Microsoft Business Solutions CRM software hotfix and update package naming standards