Outlook Redemption works around limitations imposed by the Outlook Security Patch and Service Pack 2 of MS Office 98/2000 and Office 2002/2003/2007 (which include Security Patch) plus provides a number of objects and functions to work with properties and functionality not exposed through the Outlook object model.
As of version 4.0, Redemption library also includes the RDO (Redemption Data Objects) family of objects that can function as a CDO 1.21 replacement.