You use Microsoft Word to start a Mail Merge that is configured to send email messages to the recipients. However, Microsoft Outlook does not send the email messages. In some cases, you do not receive an error message. Or, you may receive the following error message:
Word could not load the e-mail envelope. This could be caused by a network connection problem or a problem with your Office installation.
If you are using Microsoft Outlook 2002, Microsoft Office Outlook 2003, or Microsoft Office Outlook 2007, this issue may occur if you install a newer version of Microsoft Office and then uninstall the newer version. This issue also occurs when you install a trial edition of a newer version of Microsoft Office.
If you are using Microsoft Outlook 2010, this issue may occur if you install the 64-bit version of Microsoft Office 2010 or of Microsoft Outlook 2010, you uninstall the 64-bit version, and then you install the 32-bit version.
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:
322756 How to back up and restore the registry in Windows
Outlook 2002, Outlook 2003, or Outlook 2007
To resolve this issue for Outlook 2002, for Outlook 2003, or for Outlook 2007, follow these steps:
Exit all Microsoft Office applications.
Start Registry Editor:
In Windows Vista or in Windows 7, click Start, type regedit in the Start Search box, and then press Enter.
If you are prompted for an administrator password or for confirmation, type the password, or provide confirmation.
In Windows XP, click Start, click Run, type regedit in the Open box, and then click OK.
Locate and then click the following registry subkey: