When using POP3 to read your email, your email program deletes the messages from the server right after downloading them to your local computer. In case you wish to configure your Outlook program to leave a copy of the downloaded messages on the server, please follow the steps below:For Outlook Express:
Start your Outlook Express program.
From the menu Tools -> Accounts. Select the account you wish to modify, and click on Properties.
Go to the Advanced tab of the Properties window, and check the Leave a copy of messages on the server option.
For MS Outlook:
Start your MS Outlook program.
From the menu Tools -> E-mail accounts -> View or change existing email accounts select the account you wish to modify, and click on Change.
Click on the More Settings button.
Go to the Advanced tab of the Properties window, and check the Leave a copy of messages on the server option.