Updated from the previous version of the Beta to the latest version released today, then removed and re-added the account in Outlook (removed connection from Webmail before re-adding as well).

Now suddenly doing a reply-all to any message, even one just sent to me, includes myself in the recipients.  This screams "Outlook Issue" to me but it was the updating of SmarterMail that triggered the new behavior so I figured I'd mention it here and see if I'm the only one or not.