Access - finding a missing reference

I have a little problem.  We have an Access application that was originally created in Office 2000.
It is now running quite successfully in Office 2007.
However, the application is also used by another organisation in a remote location.
They have just upgraded to Office 2010 and the Access application throws up multiple errors on opening - missing or broken reference to MSCAL.OCX version 7.0

I deduced that this was because I was using a date picker in the original application that is no longer supported in Office 2010.

I have gone through every form in the application and removed the date picker where it occurs (Office 2007 now has a default picker that is fine).

However the Office 2010 system still throws up a couple of instances of the missing reference error.
Unfortunately I do not have Office 2010 available here, so cannot really do much to further diagnose the problem.

So my question is - is there a way that I can look in my application and find out where these references are coming from?

We do have a backup strategy, which is to install Office 2007 on the remote system, but I would rather avoid that if I can.

Regards

Richard