I created a personal distribution list on one of my Exchange connected
Outlook mailboxes. Inside this list I included 3 addresses; my GMail,
another Exchange connected Outlook account, and a third SMTP/internet
address (which is a blackhole so "no one" received it). In the
compose window only a single name was shown, that of the list I
created. After it was send I checked both receiving accounts and the
sending account's "sent mail" folder. ALL THREE showed the complete
list of names and e-mail addresses. NOTHING was "hidden". Even the
"Sent Mail" copy no longer showed the list name, but the individuals
whom I'd addressed. THIS IS EXACTLY HOW IT WORKS WITH GMAIL, except
that GMail expands it when you put it in the box, not after you hit
send. This is AHEAD of Outlook, as I might want to send to everyone
in the group EXCEPT 1. With GMail, it's easy to just find the one and
delete it.
I also ran a test with my ADMINISTRATOR CREATED, EXCHANGE "team" list.
This time the name alone remained. BUT, on either Exchange created
account, I could click a "plus sign" and it expanded to all the names
on the list. Nothing hidden. The only reason it showed up different
in the GMail account was because the administrator had created an
internet addressable address for the list, which is what showed up.
This is an EXCHANGE SERVER function, not an Outlook function. You can
achieve those same results by using a Google Group, like this one.
You'll notice that no individual's e-mails are listed in the TO
section, but many thousands receive it.
If you don't want to use the BCC field, and don't want people to see
individual addressees, and you want anyone to be able to "reply all"
to everyone else; then you need a list server. Google, Yahoo, and
Microsoft all have "groups", like this one, that function as list
servers. You can get additional help on Google's groups here:
http://groups.google.com/group/Google-Groups-Guide
Yahoo and Microsoft have similar pages. Having used all three
services myself, I'm partial to Google Groups, but it's entirely up to
the users, and your requirements.
If you simply want to send to a bunch of people and don't want them to
see each others names, then use BCC.