well one thing that doesn't make sense here is that you are dec'ing a MAPI namespace and you're not even using it. 
but, that point aside, you are apparently using the dictionary object to get your outlook info. and that's fine. personally I don't use it, ever. and you are getting the data you already have by getting the keys. so, is there anything you can possibly get from these articles?
https://docs.microsoft.com/en-us/off...tionary-object
https://docs.microsoft.com/en-us/off...lp/keys-method
and you obviously know how to point to a folder in any given PST, considering you wrote this line:
what you can do, I believe, is loop through your mail items and get the sender of each by capturing the sender property. see here:
https://docs.microsoft.com/en-us/off...ailitem.sender
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