2 AD domains with 1 exchange server, single sign in needed.

Hey guys, this is the scenario,
Company A has its own domain 2008 server with exchange 2007, users have email address [email protected]
Company B is a subsidiary with its own AD domain Server 2012 R2. trust is set up between the domains.
currently the users in Company B have email addresses [email protected] ( dont want to change this)
when users login to Company B's AD, they are then prompted to enter credentials for Company A's AD account.
I wan to enable a single sign on so that the email address [email protected] will authenticate using the company B credentials. thus eliminating the need for users in Company B to have 2 AD accounts.
not sure how to event start going about this process.

Use the resource forest concept
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https://technet.microsoft.com/en-SG/library/bb124765%28v=exchg.80%29.aspx
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