i got this same message after installing a trial version of Microsoft
Outlook. When I go to an email with an Exceln attachment, it gives me this
message. Then when I open it, it comes in a format not like the original. I
am totally computer iliterate so I'm at a loss. I also tried to open
previous Excel documents not in an email and same thing happens.

Why can't I open this attachment like normal as before. I Had Excel, Word
and Outlook Express.