Your network contains two Active Directory sites named Site1 and Site2. Only Site1 can be accessed from the Internet. You have an Exchange Server 2010 organization. 
You deploy a Client Access server in Site1 and enable Windows Integrated Authentication for OutlookWeb App （OWA）. 
In Site2， you deploy a Mailbox server and a Client Access server. 
You need to configure the Exchange organization to meet the following requirements：.Allow users to access their mailboxes from the Internet by using OWA 
.Prevent authentication prompts from displaying when users connect to OWA by using domain- joinedcomputers that are connected to the internal network 
What should you do？（）

Your network consists of an Active Directory forest that contains two sites named Site1 and Site2. From the Internet， users can only access servers in Site1. You have an Exchange Server 2007 organization. 
Each site contains servers that run the Client Access server role， the Mailbox server role， and the HubTransport server role. 
You plan to transition the organization to Exchange Server 2010. 
You need to recommend the server role that you must transition first to Exchange Server 2010. Your solution must provide the least amount of downtime for users in the organization. 
Which servers should you transition first？（）