Remove copies from the server in Outlook
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Click on File > Account Settings > Account Settings...
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Locate your account and double-click to open its settings.
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Click More Settings ...
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In the Advanced tab, under Delivery, make sure the settings are as follows. This will maintain a copy on the server for 14 days after it has been retrieved by your Outlook program. A copy of all emails will remain stored locally on your computer, until fully deleted within Outlook.
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Click OK.
- Click Next. A test will be run to confirm your settings are correct. Once the test is complete, click Close, then click Finish on the following screen.