If you are planning to migrate from an on premises Exchange to hosted email there’s a couple of ways to move the email.  Way one is to use a service from www.migrationwiz.com to move the email over.  Price is reasonable.

Way two is to follow the documentation for a cutover exchange as noted in the documentation:

Migrate email to Microsoft Office 365


If you have chosen to use Microsoft Office 365 as the email solution for your domain, follow the guidance in Migrate All Mailboxes to the Cloud with a Cutover Exchange Migration to start the email migration to Office 365. We recommend that you complete the email migration before you install Windows Server 2012 R2 Essentials.

noteNote
The step to remove the on-premises Exchange Server on the Source Server is mandatory if you intend to integrate Windows Server 2012 R2 Essentials with Office 365. For information about how to migrate Exchange Server public folders to Office 365, see the blog post Microsoft Exchange 2013 Public Folders Migration Scripts for Office 365.

 

After you install , you should turn on the Office 365 Integration feature in Windows Server 2012 R2 Essentials by running the Integrate with Microsoft Office 365 task.

 

 

ImportantImportant
To allow the Office 365 migration tool to connect to the Exchange Server that is running on the Source Server, you must enable RPC over HTTP on the Source Server. For information about how to enable RPC over HTTP, see How to Deploy RPC over HTTP for the First Time in Small Business Server 2003 (Standard or Premium). If you cannot successfully run the Office 365 migration tool after you enable RPC over HTTP, view the ValidPorts setting in the registry at HKEY_LOCAL_MACHINE\Software\Microsoft\Rpc\RpcProxy, and make sure that the fully qualified domain name (FQDN) for the Source Server is listed. If the FQDN is not listed, add it manually by using the following example:

 

remote. contoso.com:6001-6002;remote. contoso.com:6004 (replace contoso with the name of your domain).

 

 

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