they have Monarch but Version 4 - I'm currently on 8. Can they use the model that I've already created in 8? /b[/quote]Hi Alyson and welcome to the forum.
The answer to your question is, I'm afraid, no.
Version 8 uses only .xmod files and version 4 only .mod files.
If you have V7 around somewhere AND your model does not use any features or functions added since Version 4, you could potentially read the report and model into V7 then save it as a .mod model file (.mod is a text file, .xmod is an xml based file) and they might be able to use that.
There are a lot of "ifs" in that suggestion though.
If the model is not too complicated they could easily recreate it in V4, subject to the caveats mentioned above or maybe finding other ways to achieve the same result.
Alternatively what a great opportunity for them to upgrade ...