Press the Delete key or Delete on the toolbar, or drag the message to the Trash or Deleted Items folder.

I'm having the exact same issue - Moved from Exchange to Exchange Online/365 and I can't remove the old account from Outlook for Mac 2011 (using Settings / Accounts / Delete). Outlook crashes every time. Same if I go into Work Offline mode, unfortunately. After some googling, I found this link to manually remove the account: • Shut down Outlook • Delete the folder ~/Documents/Microsoft User Data/Office 2011 Identities/Main Identity and its subfolders. This will remove everything from outlook, so if you have more than the 1 account set up, they will all be deleted. But it's a clean start. Worked for me, as I only had the old Exchange account(s) so they all needed to be deleted anyway.

Then add the O365 account back, or even better, download the new version of Outlook for Mac (2015) and use it. Smart board software for macs. Hope this helps. Here's the issue I had. Two accounts because we migrated to Office365. Tried to remove the old account and Outlook (2011) crashed. From then on, every time I'd try to remove the account, Outlook would crash. My plan was to make a pst backup, and just manually remove all account info via squall's method above, but at the end of creating the pst file, Outlook crashed again.

This automatically prompted the Microsoft Database Recovery Tool to open, and it recreated her entire profile. After this tool ran its course, I was able to delete the old email account without issue (I put Outlook in offline mode to delete the account, just in case).

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.” and “Messaging interface has caused an unknown error.” There are 4 easy methods which you can use to solve this for most situations.

Note: If you have a message stuck in your Outbox see;. If you get the error “The Folder is full” see;. Method 1 – Empty the Deleted Items folder The easiest method is to first empty the Deleted Items folder and then try to delete the message again.

A quick way to do this is by right clicking on the Deleted Items folder and choosing “Empty folder”. You’ll also find this command when you select the Deleted Items folder and then select the Folder tab of the Ribbon.

Method 2 – Hard delete the message You 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. Method 3 – Edit the message By editing the message first and saving it, you could reset a particular corruption of the message which allows you to remove it normally afterwards; • Open the message by double clicking on it.• 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 • Type or remove some characters (I usually type 3 spaces).• Save and close the message.• Try to delete the message again. Method 4 – Scan your pst-file for errors If 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.