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There are two alternatives I've figured out:
1) Forward every email from Outbox/Inbox to [same person] - only problem is that it'll appear that it came from [person] and you won't be able to reply because you'll be replying to yourself.
2) Open each email individually copy/pasting email contents into notepad and then saving it into a style that Act! can read, then put it into the folder where Act! keeps its Inbox data. Of course with over a 100 emails in both the inbox and outbox it'll take forever and a day.