Exchange 2007 sp2 SCR support for different AD domains

Hi, I hope somebody could provide some assistance on the following
question. Is the following a supported microsoft setup for SCR, i.e
can you enable SCR with the following setup?

UK - AD Site: ukcompany.local
UKExcSrvA - Mailbox Role
UKExcSrvB - HT & CAS Roles

USA - AD Site: usacompany.local
USAExcSrvA - Mailbox Role
USAExcSrvB - HT & CAS Roles

UK & USA sites are connected via a high speed 100mb WAN connection.
ukcompany.local and usacompany.local AD domains have a trust
established. Both are native 2003 domains. To save money the customer
does not wish to install Exchange enterprise.

Many Thanks
Clinton

A trust relationship "established"?

A trust relationship "established"? That says differemt forests.
If they are in a single forest then you did not need to mention anything
about trusts and there is nothing to stop you putting an SCR target in
a different domain.
If they are in two forests then you cannot SCR between them.

As Mark says,if ukcompany.local and usacompany.

As Mark says,

if ukcompany.local and usacompany.local are two Domains in a single Forest
then that is fine.

However in this case they are not, they are two seperate Forests - so it is
not possible.

Oliver