Since you all ready have Exchange 5.5, you have the ability to link
these servers, standard editions, with Site Connectors. You can run Site
Connectors over a VPN if you configure the Exchange Servers properly. You
may want to limit them to specific RPC ports per this article below.
Setting TCP/IP Port Numbers for Internet Firewalls.
Then you have to configure your firewall/VPN servers to permit communication
between those 2 servers on those specified ports you choose to configure,
along with port 135 for RPC.
Or you can try some Microsoft resellers to see if they are still carrying
the X.400 Connectors for sale for Exchange 5.5, but I think they may not be.
If you do find them, post here, I may be interested as well. If you do the
X.400 connectors, you have fewer ports (TCP102) to let through the
firewall/VPN. The X.400 connectors will not care about the trust once they
are built, they use their own security (i.e. none unless defined).
Basically the MTA for each server can be configured for a password, but by
default they are not. That is especially nice for when you do NOT want to
have a permanent trust between the 2 domains.
> My company has two site connected by a VPN. We want to link the two
> Exchange servers. However the company has the standard version, so there
> no x400 stack.
> Is there an add on to add the x400 stack? Or is there another way to link
> the two servers. Please note each office is its own NT 4 domain. There is
> bidirectional trust between the two.
> David Dempsey