Email messages that are tracked by using the Microsoft Dynamics CRM 4.0 client for Microsoft Office Outlook use GUIDs instead of valid messageids in Microsoft Dynamics CRM 4.0

When you track an email message by using the Microsoft Dynamics CRM 4.0 client for Microsoft Office Outlook in Microsoft Dynamics CRM 4.0, the messageid attribute of the email message is set to a GUID instead of to a valid Microsoft Exchange messageid. Therefore, you cannot send the email message out of the Exchange organization if the messageid verification is used. 

Important 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: This problem is fixed in the latest cumulative update rollup for Microsoft Dynamics CRM 4.0. For more information about the latest cumulative update rollup for Microsoft Dynamics CRM 4.0, click the following article number to view the article in the Microsoft Knowledge Base: Note This problem was originally fixed in Update Rollup 18 for Microsoft Dynamics CRM 4.0.
For more information about Update Rollup 18 for Microsoft Dynamics CRM 4.0, click the following article number to view the article in the Microsoft Knowledge Base: To enable this fix on the CRM server, follow these steps.

Note This fix is not supported if the CRM Server is installed on a computer that is running Windows Server 2003.

1. Click Start, click Run, and then type regedit.
2. Browse to the following location:
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSCRM
3. Right-click the MSCRM registry key hive, and then click New DWORD (32-Bit) Value.
4. Name the registry key OptimizeOrgImport_KeepUserMappings.
5. Set the value of the registry key that you just added to 1.

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:For more information about Microsoft Business Solutions CRM software hotfix and update package terminology, click the following article number to view the article in the Microsoft Knowledge Base: