Purging Messages from IMAP folders from Outlook
Select the IMAP Mailbox (Folder) you want to manage
Note: in this example we will purge Holding-SPAMWarningHigh Mailbox
Click on one of the message and then select all by either Edit | Select All …. or… Edit | Select All
… or… try “Ctrl” + the letter “A” … or… try Right Click | Select All? Which is the best way to select All? The way YOU do it Edit | Select All
All the Messages are now Selected (highlighted)
Notice the deleted messages have a line through them
Note: Deleted Messages are NOT Purged from the system
Edit | Undelete In fact…, you can “Undelete” messages that haven’t been purged
Edit | Purge Deleted Messages To Purge ‘Deleted Messages’ select “Purge Deleted Messages”
All the messages are now Purged from the Server