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Exchange Migration Require 2 BES servers??

I am planning an Exchange transition from 2003 to 2010.
We are already running BES 5.x

If our transition is going to last more than a few days, can our BES be configured to work with mailbox users on both the Exchange 2003 and the Exchange 2010 environment? Or can BES only connect to a single Exchange Organization because of the MAPI profile?  We have a few thousand mailboxes, and with the desire to have a subset of users moved to the Exchange 2010 server ahead of time for testing we would like to understand how BES can connect to users in both Exchange 2003 and Exchange 2010 at the same time.  Is this possible?
1 Solution
Old UserCommented:
You will not need a second BES server as long as you give your besadmin account the relevant permissions on the new exchange server.
If you are unsure see the below article for all the correct permission and a link to the correct MAPI version

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