deleting old email files

after running file scan cannot delete old emails comes up error with a red X

I am running windows 10 plus outlook.com email

Need a lot more info from you e.g.

Operating system.

Email provider .

Does your email not allow you to delete them from within its program?

ccleaner Tools Programme Disk analyser after running this programmes come up files to delete , has many old emails which it will not delete comes up error

Who is your email provider? Gmail? Outlook? Thunderbird ?

Do you use Windows 10? Windows 7 ?

18 hours ago, hazelnut said:
<div class="ipsQuote_contents">
	<p>
		Who is your email provider? Gmail?  Outlook? Thunderbird ?
	</p>

	<p>
		Do you use Windows 10?  Windows 7 ?
	</p>
</div>

I am running windows 10 plus outlook.com