从.net 2.0升级到3.5时的兼容性

For the moment we're still working with the 2.0 framework and and although 2.0 provides all the necessary we need for the moment, we'll have to move on to 3.5 sooner or later. The other day there was an in house discussion going on whether there is any risk involved in this upgrade, and this risk was not to be taken lightly since all our clients are still using the 2.0 framework. There was a colleague who stated that it would be safer to just recompile all our products against the 3.5 framework en do complete new roll out. This would tackle any compatibility issues. A lot of work indeed and maybe unnecessary, I believe that wen Microsoft grantees that the framework is backward compatible why should we have any doubts about it? Am I right about this?For the moment we're still working with the 2.0