i made the mistake apparently of trying to overwrite an Outlook 2007
Outlook.pst file with the one i was bringing over from Outlook 2003 (I think
it was '03). I'd moved that file in this way before (albeit between the same
version). 2007 does not recognize the replaced file as a .pst file and now
won't open at all; and it doesn't automatically offer to rebuild a new .pst
file either. So how do I get Outlook running again, and how do I open my old
mail?

thanks,