Windows Mail to Windows Live Mail issue

First off, this is not a question of how to transfer messages from WM to WLM. I can do that just fine. My problem is that when I do transfer WM messages to WLM, information such as whether or not the message was flagged, read, or replied to is NOT transferred. So my question is, what file in WM stores that sort of data, and can it be transferred to WLM? It is very important for me to be able to se what messages I have and haven't read or replied to, and what messages I have flagged.

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