As I mentioned yesterday we are testing an idea to make it easier for those users that need IE to just click on links in Evolution and have it work. Initial code has been pushed to our Beta GNOME Desktop and is being reviewed. You have 10 seconds to request IE after clicking on a link via a small dialog in the lower right hand corner. In the shot below, I requested IE and it used the email link. FF always launches and is sitting behind.
So how best to get the URL to Windows from Linux? Here is the technique we used, low tech and simple...which means it will work. :) This snippet of code is from the python/glade UI. It takes the URL and writes it to a file in a temporary folder. Multi-user systems need file names that will never clobber one another, so we use $USER. We then simulate them clicking on IE from GNOME via the command line. This ensures that all licenses are checked and also that we log the launch of the software.
On the Windows side of things, the .bat file looks for the file written out from python. If it's there it uses it, otherwise it just opens IE on the users configured home page.
Now to send out email to the user and alert them of the change and await feedback.