I did a mail file cleanup and then all of 500 emails were lost and there only
can see 3 new emails in mailbox,but the mail file size is not changed.

1,How can I restore the lost emails? need special tools?

2,I got an error message like below when I tried to open new emails
"Message could not be displayed
Outlook Express encountered an unexpected problem while display this
message.Check your computer for low memory or low disk space and try again."

OE installed driver has 2G free space and my computer has 768M RAM.