To access your test run, deployment, and reverse deployment files from a previous version of Visual Studio with Visual Studio ...

To access your test run, deployment, and reverse deployment files from a previous version of Visual Studio with Visual Studio 2010, you must upgrade. This upgrade tool accesses these files using their share location, upgrades them, and then uploads them to the team project collection where the upgraded test runs are stored.

Usage: TrxUpgrader.exe /collection:

Example: TrxUpgrader.exe /collection:http://localhost:8080/tfs/collection0