Thanks for your reply, I continued to check WLM options and found right clicking my email address I am using choose properties, then click the advanced tab, near the bottom there is an option called "Split apart messages then in a slect box was 60KB with box on the line at the left side had a check mark to enable that function. I removed the check mark and was able to send a 9.91MB powerpoint to an email address. I have not tried to send that size to more than one email address, going to try it again.
I kept thinking the problem was caused by Windows 7. I have reeived many message from yahoo, google sites going to many addresses using BCC some of these messages were sent to a lot of peple when each item was 5 and 6 MB's.
By the way when I was haveing this proplem just after I clicked to send the message I would get a small warning message that this email addtess does not permit sending large messages, this one will be brocken up in 256KB sections, I have tried this in the past and allways got a message back that they were never re-assembled by the recipient.