Please try,
Tools > Internet Options > Receiving (POP3) > Edit (select an account).
On the General tab uncheck: Delete mail on server once it has been succesfully downloaded.
<p>Please try,</p><p>&nbsp;</p><p>Tools &gt; Internet Options &gt; Receiving (POP3) &gt; Edit (select an account).</p><p>&nbsp;</p><p>On the <b>General </b>tab uncheck: <b>Delete mail on server once it has been succesfully downloaded.&nbsp;</b></p>