>I see lots of categories in .NET forum. Say, I see 'Universal Thread Magazine' and I think this category is not really relevant anymore.

This category will be merged into Chatter.

>However, I was unable to find a category for VS IDE question. Do you know which category can be used for questions in regards to Visual Studio? I assume .NET forum will be the good one to ask them.

As you might have seen by now, there is a category Visual Studio. But, any suggestion to improve in that area is welcome. I can create a few Visual Studio related categories if that can help.