Your opinion on an issue exchange 2010 2 different forests

I am currently working for an organization who is company A and we have just acquired a different company of like 1,000 folks. We both have separate forests with no trust and both using Exchange 2010. I was approached because the users have to check their email in basically two places which is a nightmare. What we are trying to do is come up with a temporary way to have the users to be able to check email in one place with two different forests who using exchange 2010. I have been reviewing this myself and thought of things anywhere from setting up a connector to forward email to setting up a internal relay. I figured I will ask the professionals now. What is the best solution to allow two separate companies who do not have a trust but Our autodiscover entry is on the internet to connect and check email in one place. They also VPN to our network to check email.

I am also wondering if this can be done in DNS. If I was going to do this in DNS how would I point all the mail to go to another domain if this is even possible.
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Malli BoppeCommented:
Are both the forests connected by any WAN links?. If so create trust relationship. The below  guide should expain how to coexist between Exchange forests
techdriveAuthor Commented:
Thanks for the link but can we do this without setting up a trust. They do not want to setup a trust between each forests/domain. Can I just configure DNS and then just setup a connector directly between hub transport servers bypassing the email appliance. This is over a WAN separate locations.
Malli BoppeCommented:
You probably could. You need to have mail enabled contacts in the both the forests. So userA in forest A would have a mailbox in  the forestA but a mail enabled contact in the forest B.
Simon Butler (Sembee)ConsultantCommented:
If you are using Outlook 2010 then you can connect to two different forests at the same time.
Otherwise it is going to be a forwarding nightmare, particularly for 1000 users.


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techdriveAuthor Commented:
So can this be done with DNS. If I was to put a pointer to deliver all email from Domain B to Domain A will that work?
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