I know in Visual Studio 2008 you can target a specific framework with your projects, but from what I have been told if you open a project originally created in Visual Studio 2003 or 2005 in Visual Studio 2008, it requires you to upgrade the project to a 2008 project to work on it. Does Visual Studio 2010 have this same type of restriction?
It would be very nice being able to use features of 2010 when working in our projects that target different frameworks, but we do not want to force all of our developers to upgrade in order to continue working in these projects.
This is not a restriction on multi-targeting. It’s a restriction on multiple versions of Visual Studio operating on the same projects.
Yes, you’ll have to upgrade the project files. This is why it’s best for all developers within an organization to switch over at the same time.
This in no way restricts multi-targeting.