If you are a long-time developer of Visual  Studio extensions (add-ins, packages, etc.) chances are that you are tired of telling your users that your extension won’t work on the Express Editions of Visual Studio.

And if you still think that it should work because Microsoft’s extensions work, repeat after me:

“Visual Studio Express edition doesn’t support extensions
Visual Studio Express edition doesn’t support extensions
Visual Studio Express edition doesn’t support extensions
…”

I explained it more elaborated in this other post: Visual Studio Express edition doesn’t support extensions (despite its Extension Manager).

Now, if you want to change this, you can tell Microsoft voting on the two UserVoice requests that are open:

Allow 3rd party Extensions (vsix) in Visual Studio Express editions
Allow extensions/plugins for VS Express