For this migration scenario the Exchange Server Pro organization will be migrating from Exchange Server 2010 to Exchange Server 2013. Although this scenario will not precisely match yours, it is intended to provide as much useful information as possible to help you with your own migration project.

Current Environment

The current environment is built on a “head office/branch office” topology, with the head office location being the only internet-facing site.


At the head office location a pair of multi-role Exchange 2010 servers are deployed in a DAG, along with a public folder/Unified Messaging server, and an Edge Transport server in the DMZ. The internet connection is firewalled using Forefront TMG which is also used to publish Exchange services to the internet.


At the branch office location a single multi-role Exchange 2010 server is deployed. There is no internet connection at this site.


The organization makes use of many of the features of Exchange Server 2010, such as:

  • Outlook Anywhere and OWA for external access
  • ActiveSync for mobile device access
  • Native archiving
  • Public folders
  • Unified messaging
  • Transport rules

Client machines exist at both the head office and branch office locations.

Target Environment

Although the existing environment was suitable at the time it was deployed, a different topology is planned to be deployed to meet new requirements for the business.

For the Exchange Server environment this means moving to a highly-available and site-resilient solution hosted in two dedicated datacenters. The head office and branch office locations will continue to host end users, with upgraded WAN connections to manage the increase in network traffic.


The Exchange Server Pro organization will deploy a solution that aligns with the Preferred Architecture for Exchange Server 2013, beginning with Datacenter 1 and expanding to Datacenter 2 in a later phase of the project.

In the next part of this series we’ll begin looking at the information gathering phase of the project.

For more information see the Exchange Server 2010 to 2013 Migration Guide.

About the Author

Paul Cunningham

Paul is a former Microsoft MVP for Office Apps and Services. He works as a consultant, writer, and trainer specializing in Office 365 and Exchange Server. Paul no longer writes for

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