Building Wix installer for Outlook plugin, and customizations

We have an outlook attachment for 2007 and above. Two separate projects to span the differences in 2007 versus 2010+. The project was developed in VS2010 which had a builtin installer. We want a Wix based installer for this. We don't want multiple installers though, we want a single installer that detects if outlook is present, then installs the appropriate plugin for the version of outlook (and validates 32bit versus 64bit to install properly). We don't want a really large package size either... We can build the project and provide binaries, but could use assistance to make sure we are building them the way needed since we are using VS2013 and not VS2010. We have the complete source code for VS2010, but we don't use 2010 and cannot build this project properly now. If we are happy with your service, we may offer ongoing development on the project to you. If you have experience with windows shell addons, we may favor your bid. If you have OSX experience in developing Mail plugins, we may favor your bid provided you can do both this as well as development on OSX.