Automatically purge the deleted items Outlook 2007-2013 on IMAP account
You can configure Microsoft Outlook so that when you switch between folders, any items you have marked for deletion are purged from the IMAP mail server.
- Click a folder in your IMAP e-mail account.
- On the Folder menu, click on Purge
- Click Purge Options.
The Internet E-mail Settings dialog box opens.
- On the General tab, under Purge Options, select the Purge items when switching folders while online check box.