You may find that Outlook 2013 IMAP folders are not behaving the way it should be when you delete an email and it remains on your webmail or other devices such as iphone/ipad.
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Automatically purge the deleted items
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 Edit menu, point to Purge Deleted Messages.
- 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.
Note You must be working online with the mail server for this feature to work.
Manually purge deleted items – Outlook 2013
To permanently delete the items marked for deletion, do the following:
- Click a folder in your IMAP e-mail account.
- On the Edit menu, point to Purge Deleted Messages.
- Do one of the following:
- Click Purge Marked Items in “folder“.
Only items marked for deletion in the folder that you are in are purged from the IMAP mail server.
- Click Purge Marked Items in “e-mail account“.
All items marked for deletion in any folder for this IMAP e-mail account are purged from the IMAP mail server.
- Click Purge Marked Items in All Accounts.
All items marked for deletion in any folder for any IMAP e-mail account are purged from the IMAP mail server.
Note You must be working online with the mail server for this feature to work.
Article source: http://office.microsoft.com/en-za/outlook-help/purge-imap-items-marked-for-deletion-HP010080420.aspx
**This article is for educational purposes only, if you are not an advanced user please contact your local computer support technician for assistance**