As described in the header I can not find the button for purging mails manually that I have marked for deletion in an IMAP folder.
The Problem only occours in Outlook 2010
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I've found that (in Outlook 2007 anyway) the only trigger to get the IMAP folders to purge is to leave the folder (click on a different (IMAP) folder) and go back into it.
I was hoping there would be a better way in 2010 (which I don't use yet), but your question is leading me to believe that's not the case. :(