Outlook Express not locking mailbox

[lexvista]

The reason it keeps resending the same mail is because the mail server is not ending the session.So when you connect again it starts from scratch.

Have you tried deleting the mail account,and then reinstalling it?

I uninstalled & reinsalled outlook, no change I'm not sure if thats what you ment by mail account?

[Reverend]

Uninstall/reinstall your POP3 mail accounts,not the actual program.
Tools > Accounts.

[lexvista]

Uninstall/reinstall your POP3 mail accounts,not the actual program.
Tools > Accounts.

thanks. I got it with another fix at(http://support.microsoft.com/?id=kb;en-us;Q245620) seems i have 2 email accounts & the delivery setting were set differently, reset them to the same & it works fine.
Thanks again

[Reverend]

Glad you got it fixed.