Your network consists of a single Active Directory forest. You have an Exchange Server 2003 organization. You need to create a plan to transition the organization to Exchange Server 2010. The plan must meet the following requirements： .Ensure that e-mail messages can be sent between all users in the organization .Ensure that administrators can modify address lists from Exchange Server 2010 servers .Ensure that users who are moved to Exchange Server 2010 can access all public folders in the organization What should you include in the plan？（）