MSDN: List of Breaking Changes .Net 1.1 -> .Net 2.0

We, the .Net developers, will eventually move on to the .NET 2.0. As detailed in several articles, some of them posted here, too, we might experience troubles or unexpected applications behavior when we port the existing .Net 1.1 software to the new .Net 2.0 Framework.

Here it is a list of Breaking Changes reported / noticed by Microsoft when porting applications to .Net 2.0

http://msdn.microsoft.com/netframework/default.aspx?pull=/library/en-us/dnnetdep/html/listofbreakingchanges.asp

Breaking changes are changes in either the .NET
Framework (runtime breaking changes) or Visual Studio (design/compile/project
upgrade) that make certain application and development scenarios behave
differently. These are not necessarily changes that we have found to impact an
application, rather these are changes in behavior discovered during design
review and testing that could potentially impact an application. In all of our
application compatibility testing, we've found fewer than 10 of these impacting
an application.