Yikes!
After hearing from Scott Gu at Build that Visual Studio 2011 has project compatibility with older versions, I opened one of my personal projects (C# winform project) in 2011, then attempted to open it again in Visual Studio 2010. Well, guess what? Yup - it won't open in 2010. I get the message "The selected file is a solution file, but was created by a newer version of this application and cannot be opened".
Has anyone got it to work? This is a junk project and it doesn't matter if I can't fix it, but I thought this was supposed to remain backwards compatible (I remember clapping when told that it would work in the keynote!)
Richard.
EDIT
Looks like I managed to manually fix the solution file by editing the .sln file in notepad.
Change:
Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 11
To:
Microsoft Visual Studio Solution File, Format Version 11.00
# Visual Studio 2010
