You are migrating to an Exchange 2007 environment. Target accounts are not mailbox-enabling. DSA log reports: "Two recipient policies with same order value found!" and "Error 0xe1000005. Internal DSA error"
This is caused by two recipient policies in the target environment that have the same "priority" value. This value is stored in the msExchPolicyOrder attribute of the recipient policy.
Examine your target recipient policies. In some 2003/2007 environments, multiple policies may have been set up in ESM with a priority of "highest". This corresponds to a msExchPolicyOrder value of 0. When these policies are viewed using the Exchange Management Console in 2007, the priority is listed as 0, not "highest", as this setting is not available in 2007.
The priority/msExchPolicyOrder value of each recipient policy must be unique. Please re-assign the priorities as needed, and the DSA will successfully mailbox enable the accounts.