I wish I could give you better news, but I don't see any solution with Outlook products . . .
This is my personal opinion, and does not represent SmarterMail, or SmarterTools, in any way, but there are major issues with Outlook, in all versions, and I doubt that the Outlook archive will ever be capable of synching with SmarterMail - it's not an IETF standard and there's no published protocol for it. IETF recognized E-Mail protocols include POP; SMTP; IMAP; and, with the advent of Microsoft's introduction of Exchange, EWS.
Now that Microsoft has made OUTLOOK.COM available online, both as a hosted service, and as a hosting service for registered domains, coupled with the fact that "boxed product" will not be available for Outlook products, beginning with the next generation of Outlook "software," I seriously doubt that the ability to synch external Outlook archives will be considered by many MX server software vendors.
What we are seeing, as a viable alternative to Outlook, is "EM Client" -- an Outlook look alike with much more functionality that works much better than any current Outlook product, having no issues whatsoever with SmarterMail, or any other mail server.
There's a "free" download available, which imposes some limitations, and the paid client is not that expensive. There's even a "lifetime upgrade" license, which will allow you to receive upgrades for all future versions for one, very low, price.
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