[ngw] Corporate Address Book Group with users in a different domain??

[techgw1 at gmail.com]

We are on GW2014 and we have various Groups created in the GW Admin
Console. Membership is based on location.

We acquired a company and of course they are not on GroupWise. They are on
Exchange.
Can I created a group in our GroupWise system and add these new users (no
groupwise accounts) with their current email address domain so we can
broadcast company emails that they will receive  along with all of our GW
users ??

Any ideas. ?
Thanks
Bob