Exchange 2010 Email policies

I've just taken over administration of a network with practically no structure in AD.  We have a corporate office and over 30 branch offices.  I've created one OU called branches and inside that I've created OU's for each branch,  Inside that OU I have OU's for users, and workstations.

I've started moving users to their appropriate OU based on their branch.  I have a current Exchange 2010 email address policy that's applied to the main Users OU.  I'd like to apply that to each of the user OU's in their respective branches.  If I apply the policy to the branches OU does that cover all the OU's inside it?

If not what is the best approach to applying the email address policy to all users?
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The way I would normally do that is to use an ad attribute I.e office, department, company and assign the address policy based on that.
Even if you end up moving years around in as they will maintain that policy

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