To upgrade Team Foundation Server Basic or Express
Tip: This topic is for upgrading a basic installation of TFS (no SharePoint, no reporting). If you have SharePoint or reporting, consider using the standard TFS upgrade (in-place) or the advanced TFS upgrade (move TFS to a new machine) instead.
Double Check. Verify that the operating system and hardware meet the requirements for the new version of Team Foundation Server. New for this version of TFS, you must use a 64-bit server if you use a server operating system.
Determine the service account you will use for Team Foundation Server. By default, TFS uses Network Service. In most cases, you should use the same account you used for the previous installation or consider using Network Service.
There’s more information on MSDN: System Requirements for Team Foundation Server, or Accounts Required for Installation of Team Foundation Server.
Visit Microsoft Update. If you’re using SQL Server Express for TFS, use Microsoft Update to make sure that SQL Server Express has the latest service pack (SP). Similar to Windows Update, Microsoft Update is for Microsoft software other than operating systems. Use the Windows Update Control Panel to opt into Microsoft Update and check for updates.
If you’re running SQL Server Express 2008 with either SP2 or SP3, the TFS upgrade wizard will be able to automatically upgrade your installation of SQL Server Express during TFS upgrade.
Tip: If you don’t know if you’re using SQL Express, look at the Application Tier node in the TFS administration console. Scroll down to Data Tier Summary and look for SQLServerExpress to confirm.
Uninstall TFS. Use Control Panel to completely uninstall Team Foundation Server.
Tip: If you’re upgrading from a prerelease version of TFS 2012, you don’t have to uninstall the old version of TFS. You can skip this step.
Upgrade TFS. Run the Team Foundation Server install from the product DVD and then use the Upgrade Configuration wizard to upgrade your installation.
For more information: Run TFS Upgrade Wizard
After you upgrade the application tier, you might want to install the new build service. You can’t use TFS 2010 build service with Team Foundation Server 2012, but you can install the new build service side-by-side on the same server as the TFS 2010 build service.