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CLSID_OEEnvelope

Several 2007 Microsoft Office applications provide an API that lets a mail client interface with 2007 Office applications when the API is implemented by the mail client. This API provides an integrated experience for sending a copy of a 2007 Office document. If the default mail client implements the API, you can use the Microsoft Office Outlook 2007 mail envelope experience directly in 2007 Office applications.

https://support.microsoft.com/kb/926453