Outlook 2007 - Permanently Deleting Emails Using IMAP
If you recently made the switch from POP3 to IMAP configuration in Outlook 2007, you might be wondering why deleting an email from your inbox doesn’t actually remove the message.
Simply follow these steps to customize your Outlook toolbar and you will soon be able to permanently remove emails from your inbox.
Choose View > Toolbars > Customize from the main menu
From the Commands tab, click on the Edit category (see illustration)
Scroll through the list of commands until you find Purge Deleted Messages
Click and drag Purge Deleted Messages into the toolbar at the top of your screen, and drop the new button next to the Delete button icon.
You should see the new button in your toolbar (See screen shots below for details). That’s it! You’re back on track, and you can start deleting all those pesky emails again.
UPDATE: If you don't want to permanently delete messages, you can hide deleted items from your inbox by choosing Current View > Hide Messages Marked For Deletion from the View menu at the top of your screen.