Installing Office 2K Service Pack 2 includes the Email Security Update. This update is responsible for presenting a Security Warning dialog to the user when an external program attempts to access certain properties/methods of the Outlook object model, including the Send method of an email item, as well as accessing the address book or contacts. The update serves it's purpose, which is to prevent worms/viruses that propogate thru email. However, it presents a major headache to developers who legitimately send emails by automating Outlook.
Additionally, Microsoft has decided to lockdown the Outlook object model with the release of Outlook 2K2. The email security update is included and several functionalities are no longer exposed via COM automation, which will leave many VB/VFP developers disgruntled once their users finally do upgrade.
Fortunately, there is an apparent answer to this riddle. See http://www.dimastr.com/redemption/ for more details. Redemption is a high-level COM interface (In-process DLL) to Extended MAPI, which is what C++ & Delphi developers will use to bypass the limitations.
Just for clarification, I've only read the documentation for what this product claims to do. As of the time of this writing, I have not tested it. Anyone who does test it, feel free to email me with your findings.