You have an Exchange Server 2010 organization. 
Your companys compliance policy states that the following occurs when a user leaves the company：.The user account is disabled
.The user account and mailbox are deleted after six months .All e-mail messages in the mailbox are retained for three years 
You need to recommend a solution to retain the e-mail messages of users who leave the company.The solution must meet the following requirements：
.Ensure that a group named Group1 can manage the process .Minimize disk space required to store the mailbox databases
What should you recommend？（）

Your company has a Windows Server 2003 Active Directory forest that contains a single domain. The functional level of the forest is set to Windows 2000 native. 
You have an Exchange organization that contains Exchange Server 2003 Service Pack 2 （SP2） andExchange Server 2007 Service Pack 2 （SP2） servers. 
You plan to transition the organization to Exchange Server 2010. 
You need to prepare Active Directory for the installation of the first Exchange Server 2010 server. 
What should you do？（）