Dear Sirs.
I hope I'm asking this on the correct forum, otherwise I apologise.
We just recently developed a temporary optimization method for sending out payment reminders to debitors. The solution is afilliated with Word and its Mail Merge features. The solution is working smoothly, however, when we send a batch of mails with Mail Merge, we don't get the option to archive the sent mail(s) in SuperOffice; Which you normally do, if the settings are enabled in Outlook. (See below)

This is of course an issue for us, as we'd like to archive to whom we've sent payment reminders in SuperOffice.
I tried going into my "Sent messagers"-folder i Outlook and hoped, I could just archieve the whole batch by selecting the lot of them; But that option doesn't unfortuantely seem to be valid.
My question is therefore twofold; Is there a wordaround/option for archiving multiple mails at once or is it somehow possible to archieve mails sent from a mail merge in Word?
Thanks beforehand.
ADMIN: Not API/SDK related, therefore moved to Technical Forums.