Exchange 2003 Coexistence with Exchange 2010

We currently have an existing Exchange 2003 organization, and will be transitioning to Exchange 2010, we have the 2010 infrastructure built, all AD prep'ed etc.. but this coexistence will be a little lengthy as it's compounded by a domino to exchnage migration as well,

What i'm wondering is if anyone has seen any list of what we will expect for limitations of running Exchange 2010 in an Exchange 2003 organization, with a 2003 Forest Functional level Domain? I ran in to one issue out of the gate with adding a second recipient address policy by container where it did not allow this for specific containers due to legacy servers being detected.
pathixAsked:
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BusbarSolutions ArchitectCommented:
limitations, none that I am aware of, but you will need to follow the upgrade steps and keep the Exchange 2003 running, if went fine there is no limitations
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