A2K app in A2K7

I have an application that runs as a .mde, just fine with A2K and A2K3
but gets errors and won't start when trying to run it in A2K7.

I haven't had an opportunity yet to work with Access 2007 as I don't
have it. The user said something about an error message regarding a
toolbar that does not exist in A2K7. It seems likely that code is
trying hide a toolbar that doesn't exist.

I can't upgrade the app - there are many users who do not have A2K7. I
have seen messages, in this newsgroup, about a "compatibility mode" or
something.

Thanks for any suggestions of how to deal with this.

Arch