Outlook VBA could do this, but not without knowing a great deal more about your Excel worksheet that contains the data. You would need to interrogate the worksheet to provide the data then list it for display. I do however agree with 'Logit' that it would make more sense to create an e-mail from Excel and send it to the parties who need to see it.
If you were going to interrogate the worksheet in Outlook then I would suggest displaying the list in an Outlook Note rather than a message box so that it can be referred to again later in the day.
If you want help with that then post a sample worksheet (with anonymised data) so that we can see how it is laid out.