I haven't done much myself with Outlook automation; I mostly stick to Excel and Word... But if I needed to, here's where I'd look:

I am assuming you found Mail::Outlook, and have determined it doesn't meet your needs. (I don't know anything about the module, except that it seems to be recent and actively maintained, so it probably handles modern Outlook.)

If you're able to have a live Outlook running, then you can use Win32::OLE to access the well-documented Outlook Object model.

Have you done a Super Search for "Outlook"?