Thanks TTran for the link and its info. I tried compacting but it didn't help. I know now that it is an Outlook problem and not Windows &. I weht to my Hotmail account, attached a large file and sent it to my email account, which is a Pop3 account. The file went out without any trouble. I next went on to the web site for the POP3 account and the file opened without problem. Next I went to Outlook where I usually read the mail from this POP3 account and it took forever to down load it. Once downloaded it reported that it could not open the file because the file was corrupted. The same happened when trying to send a large file from Outlook; it remained in the Out Box. However sending the same file from the POP3 site was no problem. I've read everything I can find to see if there is some area of Outlook that indicates a maximum file size to send or receive. I haven't found that info. If you know if there is such a place please let me know. O, BTW, I have made sure the firewall and virus software were off when sending and receiving....still no help.