how do I open an excel 97 2003 document in office 2007
 

I have a vista laptop and I cannot open emails that have a excel 97 2003
spreadsheet. I have to save the excel 2003 file to the hard drive and then
open it up which should not have to happen. I am easily able to open my word
and ppt 2003 email documents without a problem in office 2007.
Help!