title: PostSharp 4 and legacy components using older versions
body: <p>For along time we've been using legacy components originally compiled using PostSharp 2. But recently we tried to upgrade our main framework to use PostSharp 4 (we want to try out some of the new features) but now every application referring to legacy components will crash. The legacy components cannot be re-compiled for legal reasons, so that is not an option for us.</p>
  
  <p>Is it possible to have new code (in .Net 4.5 and using PostSharp 4.x) work together with legacy components (build on .Net 3.5 and PostSharp 2.x)?</p>