Outlook username and password for Two domains

[Richard C]

I have two domains,
The exchange server is in domain A. My users are on domain
B.
Seperate username and password for the users on Domain B
to connect to the Exchange on Domain A. This can not be
changed.

I remember that MS had a Reg fix were i could have the
prompt fill in automaticaly.

I am looking for the reg entry for this or if anyone knows
any other way to accomplish this.

Any help would be great.

Thanks