I have Dovecot version 1.2.9-1ubuntu6.3 installed on my server (using Maildir+), and I was reading an article on Outlook 2010 that says that Outlook will purge messages immediately if the server supports UIDPLUS.
From my Googling, all I can find is a bunch of outdated mailing list messages of people asking questions. Does Dovecot support UIDPLUS for Maildir+/Maildir? Can it be added as an extension or is there some other way of adding this functionality? Thanks!
If you want to find out which capabilities your server has, you can simply connect to it and issue the CAPABILITY command. That should show you UIDPLUS if your server supports the extension.