Upgrading Team Foundation Server can be a daunting task. Be assured that things have become easier and if you follow this guide, it will minimize your downtime.
In this page we will look at performing an in-place upgrade from TFS 2013 Update 4 to TFS 2015. In this walkthrough, we assume you are currently using a single server configuration, but might want to separate your SQL Server from your TFS server. We also assume you have a DNS entry setup for external access at tfs.northwind.com.
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Once you have prepared your environment by creating backups, testing your rollback plan, and set your Project Collections to be offline, you're ready to run the setup process that will perform the upgrade.
Whenever you upgrade software, it's a good idea to make sure that your system meets the requirements for the newer version. This is particularly important for server applications like Team Foundation Server.
If you're upgrading from TFS 2013 Update 4 to TFS 2015, there is a small difference in system requirements. Make sure that your system meets the Visual Studio Team Foundation Server 2015 RC system requirements: