title: Move all Azure DevOps items from one user to another?
body: <p>We've had a guest user working in our DevOps team, but he's now a real team member with an Office 365 license assigned etc. In other words, he has a new user account. We'd like to migrate everything from his old account to his new one, including closed items. (And if at all possible, migrate his complete history).</p>
  
  <p>Tried Google as well as a few searches here, but didn't find anything. I did find articles about migrating to a new organization, but that's irrelevant.</p>