Cannot Open Emails

[Nika]

I have just converted from Microsoft Office 2003 to 2007.
Before I converted to 2007, I was able to save my outlook emails in my
documents folder. I have used save as type: Outlook Message Format.
Since I have converted to Office 2007, I can save the email, however I get
the message asking me to choose the program I would like to open my message,
and there is no option of outlook.
Can anybody help me?
Thank you.