If your Outlook email is configured with IMAP settings and deleted items display a strikethrough you will have to configure outlook to automatically purge deleted items.
Follow the steps here
Outlook 2007: Click here: http://office.microsoft.com/en-us/out...
1. Click the File menu, then Info, then Account settings > Account settings.
2. Select the IMAP account, click the Change button, then More options.
3. Click the Deleted items tab, select Move deleted items to the following folder on the server and choose the folder Deleted Items. Please also select Purge items when switching folder while online.
- Friday, November 27, 2015