You have an Exchange Server 2010 organization that uses a namespace of mail.contoso.com. You are migrating the email inf

[answerhappygod]

You have an Exchange Server 2010 organization that uses a namespace of mail.contoso.com.
You are migrating the email infrastructure to Exchange Server 2016.
You need to minimize the number of changes that end users must make to their Microsoft Outlook client as a result of the migration.
Which two actions should you perform? Each correct answer presents part of the solution.
Each correct selection is worth one point.
NOTE:

A. Enable Outlook Anywhere on all the Exchange Server 2010 Client Access servers.
B. Move the existing mail.contoso.com namespace to point to the Exchange Server 2016 servers.
C. Create a new namespace named legacy.contoso.com and point the namespace to the Exchange Server 2010 servers.
D. Run the Set-OutlookProvider cmdlet.
E. Create a new namespace named migration.contoso.com and point the namespace to the Exchange Server 2016 servers.