When you start typing an e-mail in Entourage and Mail.app, addresses popup that you have typed before some are not in your Address Book. Where do these e-mail addresses live?

Both applications keep a record (each internally in the application) of previous email addresses and will remember and pop them up even though they're not in Address Book. You can view and edit this list by going to the Window -> Previous Recipients in Mail. I can't remember where this is in Entourage.

In any case, it has nothing to do with NUDC or Now X.
Dave Sawyer
iMac 24 2.8GHz Mac OS X 10.6.2
PowerMac G5 2GHz DP Mac OS X 10.5.8
Windows XP, Vista and Windows 7