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Plan for Exchange Online mailboxes


Topic Last Modified: 2013-10-15

Summary: Describes bandwidth, public folder, and email client software considerations for migrating Exchange Online mailboxes.

When planning to migrate Exchange Online mailboxes, here are the topics you’ll want to consider.

Your network connection to the Internet will directly impact the communication performance between your on-premises organization and your Office 365 organization. This is particularly true when moving mailboxes from your on-premises email system to Exchange Online. The amount of available network bandwidth, in combination with mailbox size and the number of mailboxes moved in parallel, will result in varied times to complete mailbox moves. Additionally, other Office 365 service offerings, such as SharePoint Online and Lync Online, may also impact the available bandwidth for messaging services.

Before moving mailboxes to Exchange Online, you should:

  • Determine the average mailbox size for mailboxes that will be moved to your Office 365 organization.

  • Determine the average connection and throughput speed to the Internet from your on-premises organization.

  • Calculate the average expected transfer speed, and plan your mailbox moves accordingly.

For more information about migration performance, see Plan to assess and reduce mailbox size for better Exchange Online migration performance.

For more information about communication performance between your on-premise and Exchange Online organizations, see Plan for Internet bandwidth usage for Office 365.

Public folders are designed for shared access and provide an easy and effective way to collect, organize, and share information with other people in your workgroup or organization. Public folders help organize content in a deep hierarchy that’s easy to browse. Users will see the full hierarchy in Outlook, which makes it easy for them to browse for the content they’re interested in. For more information about public folders in Exchange Online, see Public Folders in Exchange Online

You should have a clear picture of the email client applications used in your current environment. For most deployments, the following clients are suggested:

  • Microsoft Outlook 2013

  • Microsoft Outlook 2010 with SP1 or later

  • Outlook Web App

  • Microsoft Outlook for Mac 2011

  • Microsoft Entourage 2008 Web Services Edition

Outlook for Mac 2011 and Entourage 2008 use Exchange Web Services to communicate with Exchange Online.

If users aren’t familiar with these client applications, training may be required.

For additional information, see the following Help topics:

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