If you are using standalone instance of SharePoint 2010 and want to add SQL Express 2008 Management Studio to the machine, you may encounter errors during installation. The option looks valid is to add feature to current instance. however, it is not the correct one.
After some search on line, I found this blog with detail information Turns out you need to select New Instance option (I have no idea why) to continue. So if you were not able to install management studio for SQL Express 2008, try this article first.
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