Migration from Exchange 2003 to 2010

Hi

We are in the process of migrating from Exchange 2003 and 2010 and for current environment we are using enterprise vault 9.0.4. Can you tell me what are the steps that i need to perform to make sure users should be able to access his archive E-mails evern though when they are in 2010 server.

Also i need any articles what are the steps that i need to perform to archive the 2010 user E-mails.