Thanks for heads up SDK. We installed it on a couple machines and found that it impacted our anti-spam software so that now we are prompted everytime asking if it's ok for the software to read an Outlook address book (which it must do to compare email senders to see if OK). In poor design by Microsoft, this popup does NOT show you WHAT program is trying to access.
The mechanism was introduced in a way to keep the worms/viruses from spreading by accessing your address book. Which is a good thing! I'm glad M$ added this feature, they just didn't seem to tell anyone about these new elements being added...at least I didn't see anything.