A long documented issue is that, unlike most other mail clients, eM Client does not adaptively detect an Exchange Archive folder if the server doesn’t announce it. All other mail clients I’ve tried that support Exchange manage to do this, but eM Client does not.
One possible workaround that would leave this in the hands of the user, is to allow the Archive folder to be mapped to a specify folder in the account, much like the options that exist for IMAP accounts.
The fact that these options don’t exist for Exchange accounts suggests that these settings are specific to IMAP. But couldn’t the application itself implement such a solution?
Exchange Server: “I’m not going to announce what the Archive folder is.”
eM Client: “No problem! The user has indicated that the existing ‘Archive’ folder should be used. We’ll used that folder.”