Different Versions of SSIS

Hello Experts,

I have confusions regarding SSIS different versions and which is capable of what.
What is the difference between Shell Isolated and Shell Integrated.

In our office we have Microsoft Visual Studio 2010 Professional but with that I can not open SSIS Packages.

But we have Microsoft Visual Studio 2012 Shell (Integrated) with which we can open the SSIS Packages.

So can anyone please explain the differences and when to install what and why Professional edition can not open SSIS Package is SHELL (Integrated or Isolated) are not installed.

Thanks and Regards,
   Pratik

- Pratik
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