I'm currently trying to migrate TFS 2010 to visualstudio.com. However, I have the following message on my screen at this very moment:
"Configuration created successfully. Do you want to start migration of x to y.visualstudio.com?"
Does this migration delete the data on the current TFS or does it leave it untouched? Because I'm trying to migrate it as a test and do not want the current TFS to be modified by this tool.
The OVSMU Tool does not in any circumstance modify/write something in your source instance. So, don't worry and carry on with your migration.