Is there a way to export these settings from the registery and import
them again in the new machine?

Brian Tillman wrote:
Firas Rashid wrote:

The Problem: when performing Send/Receive, it seems Outlook doesn't
recognize that emails are already in the PST and starts downloading
the whole punch of emails exist in my account whether they are new or
not, which leave inbox with duplicate emails.

I thought Outlook keeps a list of downloaded emails in PST file itself
so it won't get them again.

No, it doesn't keep such a list there. It keeps in somewhere in the mail
profile in the registry. With a new machine (or even a new mail profile on
the same machine), Outlook will download everything it sees in the mailbox
because it has no idea what was downloaded already.
--
Brian Tillman