I've found a few instances where 2012 solutions cannot be opened in 2010. Most of the time it worked properly however.

>Test Manager is just that.. a test manager.
>
>Yes, you can install VS2012 & 2010 side-by-side, but again, Why?
>
>>Well, I have VS 2010 Ultimate installed.
>>
>>I need to find out if we (our company) already have VS 2012 to download and install. I'll keep VS 2010, but I already uninstalled 2008.
>>
>>So, I see that we have Visual Studio Premium 2012 Test Manager. Is it OK to install it on the same PC as VS 2010?
>>
>>Thanks.