We are upgrading our application to VS 2010 + .Net 4.0. Inside our company, we are using other group's library and they are .Net 2.0 assembly. Therefore we have to use useLegacyV2RuntimeActivationPolicy to load CLR 2.0 assembly. Now our application can be launched, and some basic tests are done. However the other group hesitates to move to .Net 4.0. Our concerns is that, is there any serious problem later at run time such as thread racing or more crashes? Has Microsoft done a lot of testing including performance test? Does anyone have any bad experiences? If we find any serious issue or strong concerns, we can ask other team to do the upgrade.
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