title: Why does Visual Studio 2010 ask me to update a solution created in 2010?
body: <p>I'm trying to open a VS 2010 solution on another computer, and VS is prompting me to update the solution. I don't understand why.</p>
  
  <p>Here's the story.</p>
  
  <p>I created a solution with Visual Studio 2010 on computer A, checked it into a Mercurial repository, and pushed it to the central server. Then I went on computer B, and pulled the repo. When I tried to open the solution, I got the update wizard.</p>
  
  <p>Computer A has VS 2010 SP1, and computer B has both VS 2010 SP1 and VS 2012. Both computers have the required .NET Framework versions, and computer A does not have .NET 4.5.</p>
  
  <p>Can someone explain why I need to update the solution from 2010 to 2010?</p>