Migrate Exchange Server 2010 to Exchange Server 2016 in a SBS 2003 migration scenario By Mariette Knap migration, exchange, sbs 2003 end of life, sbs 2003 migration kit In this guide we come from a migration of Exchange Server 2003 to Exchange Server 2010 and now we will migrate the Exchange Server 2010 to the latest version, Exchange Server 2016. At this point we will introduce a new Windows Server 2016 that will be joined to the adatumcorp.local domain as a member server. On this server we will install Exchange Server 2016 and continue the migration of Exchange data from the Exchange Server 2010 on the Windows Server 2012R2. I assume that the SBS 2003 (in the case of a migrating of SBS 2003 to Windows Server 2016) is no longer active in your domain. You should have completed How to migrate from SBS 2003 R2 Premium to Windows Server 2016 (Essentials) after you completed How to migrate Exchange Server 2003 from SBS 2003 R2 to a new Exchange Server 2010 on Windows Server 2012R2 When the Exchange Server 2016 is installed and properly configured it can act as a downstream proxy for the Exchange Server 2010. The other way around is not possible because Exchange Server 2010 cannot act as an upstream proxy. This way both Exchange Servers will coexist in the network. You can migrate mailboxes in batches. An Outlook client will connect to the highest version Exchange Server in our network, in our case the Exchange Server 2016, and if the mailbox for that user has not been migrated to the new server it will proxy the request. Easy migration kits Technician migration kits Easy to use migration kit Migration kit for migrating from one source (for example SBS 2003) to a new Windows Server environment built on the latest technology. This kit is ideal if you want to perform the migration of your old server yourself. The kit contains everything to ultimately run your infrastructure on more modern operating systems like Windows Server 2016/2019, Exchange Server 2016/2019 or Office 365. Success guaranteed! SBS 2003 migration kit Technician migration kits Technician kits are designed for professionals who need to carry out migration projects to Windows Server 2022 or 2025. This migration tutorial is part of the Windows Server 2022 and 2025 Technician migration kits. These utilize a Windows Server 2022 or 2025 Hyper-V host that supports multiple machines for the process. Additionally, the technician migration kits include all the 'Easy migration kits,' which allow us to maintain the same host name for the destination server. Get your Technician migration kit All our Easy Migration Kits and Technician Migration Kits come with exceptional support. In our store, you have the option to include support with your initial purchase or access it as needed by submitting a support ticket here. Prefer a hands-off approach? Our consulting services offer comprehensive migration support—just reach out to us to get started..