Several IMAP server implementations, including (older versions of) Horde, work from the Inbox folder as a root folder. New folders can then indeed only be created directly under the Inbox folder which can interfere with Outlook’s internal folder structure.
The result is that you don’t have a Junk E-mail folder and that this feature doesn’t work.
To solve this, you can set the “Root folder path” option in your account settings.
|Configure a root path if your IMAP folder structure falls under the Inbox folder.|
Note: These instructions can also be used if you are using a Gmail account and want to get rid of the separate [Gmail] folder structure and see those folders directly under your IMAP mailbox instead. For full details, see the guide; Gmail IMAP – Solving the [Gmail] separation.
Setting the Root Folder Path for your IMAP account
To make the change, you’ll have to go to the “Advanced Settings” tab of your account configuration;
- Open your Account Settings dialog;
- Outlook 2007
Tools-> Account Settings…-> tab tab E-mail
- Outlook 2010, Outlook 2013 and Outlook 2016
File-> section Info-> button Account Settings-> Account Settings…-> tab E-mail
- Outlook 2007
- Double click on your IMAP account to open the account settings.
- Click on the More Settings… button.
- Select the Advanced tab.
- At the bottom, you can set the “Root folder path” option.
- For the above example, setting it to “INBOX” solves it.
Setting the Root folder path in your IMAP account settings.
- After setting the option and confirming your way out of all of the opened dialogs, you’ll get a notification that your IMAP cache needs to be rebuild.
- In some cases, you’ll need to set the Sent Items and Deleted Items folder for the IMAP account again.