I figure out now what causes the issue of search.
Even do it is still a SLOW Search but working. Not like IMAP FAST Search.
Axigen Outlook Connector wants only the “Default” storage folder “Appdata/Local/Microsoft/Outlook” to work with search. Or else you will have the same problem that I encounter.
Even you put explicitly the “Custom / User specified Storage folder for the .pst” on indexing option still it won’t work.
Hope this will help others in the future or If the developer improved the Axigen Outlook Connector hope they can fix this issue.
Regards,
Jay