when trying to delete a message, it could be that Outlook refuses this and shows an error message. Most common error messages are;
“An unknown error has occurred.”
“Messaging interface has caused an unknown error.”
Here explainign 4 diffrent methods to troubleshoot these problems
1 – Empty the Deleted Items folder
first empty the Deleted Items folder and then try to delete the message again.
2 – Hard delete the message
SHIFT+DELETE buttonYou can also “hard delete” the message by holding the SHIFT button while clicking on the Delete button or using the Delete button on your keyboard.
This message will now skip the Deleted Items folder and will directly be permanently deleted. Outlook will display a warning if you really want to do this.
3 – Edit the message
Edit Message buttonBy editing the message first and saving it, you could reset a particular corruption of the message which allows you to remove it normally afterwards;
1. Open the message by double clicking on it.
2. Place the message in edit mode;
*Outlook 2003 and previous
Choose Edit-> Edit message…
*Outlook 2007, Outlook 2010, Outlook 2013 and Outlook 2016
Actions-> Edit Message
3. Type or remove some characters (I usually type 3 spaces).
4. Save and close the message.
5. Try to delete the message again.
4 – Scan your pst-file for errors
SCANPST.EXE buttonIf the above methods fail, the issue could be caused by a corruption within your pst-file. To fix this issues, run scanpst.exe against your Personal Storage (pst-) file. The location of scanpst.exe depends on your version of Outlook and Windows.
If you do not know the location of your pst-file, you can use one of the following methods to locate it;
– Make sure you include hidden and system files and folders when searching for pst-file
– Default locations are;
C:Documents and Settings%username%Local SettingsApplication DataMicrosoftOutlook
C:Users%username%AppDataLocalMicrosoftOutlookMy DocumentsOutlook Files
– You can also locate the file in Outlook by using;
*Right click the root folder (probably Outlook Today)-> Properties-> button Advanced-> field Filename
*Outlook 2007 and previous
File-> Data File Management…
*Outlook 2010, Outlook 2013 and Outlook 2016
File-> Account Settings-> Accounts Settings…-> tab Data Files
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