If location B doesn't have any internet connectivity but has all the
Exchange servers, and location A has the internet but no Exchange servers,
it seems you have little choice. Either you setup Edge in location B and
configure your firewall in location A to forward SMTP to it over your
internal network, or you locate it in location A and have it talk to Hubs in
location B.
Edge servers can be configured to forward mail anywhere (including to other
AD Forests/messaging systems that don't use Exchange), and to any AD Site.
No significant impact as such - you're probably doing something similar to
get inbound mail to your Exchange servers.

Signature
Bharat Suneja
MVP - Exchange
www.zenprise.com
NEW blog location:
exchangepedia.com/blog
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> Hi All,
>
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>
> Thanks