Your network contains Exchange Server 2010 servers. 
All users access their mailboxes by using Outlook Web App （OWA）. Your companys compliance policy states the following：
.All e-mail messages that contain customer contracts must be stored for three years .Users must be able to classify e-mail messages that relate to customer contracts .Users must be able to move e-mail messages to any folder 
You need to recommend a solution that supports the requirements of the compliance policy. 
What should you recommend？（）

You have an Exchange Server 2010 organization. You design a deployment of multiple Mailbox servers. 
Your companys Service Level Agreement （SLA） states that servers must support 1，000 concurrentconnections to mailboxes while maintaining an RPC latency of less than 20 milliseconds. 
You need to verify that your design meets the requirements of the SLA before you deploy servers in theproduction environment.
Which tool should you use？（）