Thanks for your reply.  I am not a "tech" person, just a home user, so many
of the posts are over my head.  I have no idea what nk2 is.  However, I read
some other posts and found one of your answers from the thread above mine
(2005) where you said "Autocompletion has nothing to do with your Contacts.  
It uses a cache of names created from email you have sent."  So does that
mean that autocomplete only draws from email addresses you've typed into the
"to" line, and never draws from your contacts folder?  If that is true, is
there some other feature that is allowing this to happen:  I type in "dad" in
the "to" line and then his entire home email address pops up to select (it's
the only one), just like with the autocomplete list.  The same thing happens
with a few other people's first name's but not everyone.  I would like to
have this feature with more names but don't know how it started in the first
place and why it's only for some names.