You have an Exchange Server 2007 organization.
You recently deployed a server that has Exchange Server 2013 installed.
The Exchange Server organization contains three servers. The servers are configured as shown in the following table.

Server2 contains a mailbox for a user named User1. You move the mailbox of User1 to Server3.
After the move, User1 fails to access his mailbox by using Outlook Web App. Users who have mailboxes on Server1 and Server2 can access their mailboxes by using Outlook Web Access.
You need to ensure that User1 can access his mailbox from the Internet by using Outlook Web App at
https://mail.contoso.com.
The solution must ensure that users who have mailboxes on Server1 and Server2 can continue to use Outlook Web Access.
Which three actions should you perform? (Each correct answer presents part of the solution. Choose three.)