I know I can link a Gmail to Outlook and move the email into a PST for archiving, but this locks my Outlook for a very long time per mailbox (they are 20-30GB each and I have 2 dozen to do).
I am looking for a way to do the same thing, but in the background.
Right now I have used the takeout from Google, but that generates an MBOX. This I need to convert to EML, then import into Outlook with yet another tool. So my current approach isn't ideal.