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If the option to Leave a copy of the message on the server is missing in Outlook 2010, it may be due to the type of email account you use. Of the most common types of email accounts, only POP3 accounts download the email to your computer.
If you have an IMAP, or HTTP (Gmail, Outlook.com etc.) account, mail is not generally stored on your computer. All email remains on the mail server until you delete it.
To enable (or disable) the Leave a copy of the message on the server option, follow these steps:
If you would like to know more about different email account types, see Introduction to e-mail account types