When you have Access 2003 and 2007 you get a very long ‘Configuring’ message when you open them alternatively.
This is not good, but I can live with it as a developer.
It really impacts our customers, when we give them a runtime in 2003, and they use Access 2007. Those customers are getting this message all day long.

Figure: This long message is caused only because they launched the Microsoft Access 2003 runtime prior

Figure: If they exit Access 2007, then they open the Access 2003 runtime app, the penalty is the long message again