To enable (or disable) the Leave a copy of the message on the server option, follow these steps:
Open Outlook.
Click the File tab > Account settings.
Highlight your current POP3 account and click Change.
Note: The window that opens will tell you what type of email account you have. (Look under Type.)
Choose More settings and click on Advanced.
You should see a check box titled: Leave a copy of messages on the server.
Checking the box will enable Leave a copy of the message on the server.
Note: Enabling Leave a copy of the message on the server will allow you to access your email from multiple computers.
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