Thanks Bruce.
Option1: Yes it will work but I am looking to search for emails directly.
Option2: doesn't work. The search for emails using any search attribute doesn't work.
Option3: Hmm...yes this is something that can tried but I wanted to avoid that routing config. I thought there is a simple way to just search for incoming emails. Pure standard, no customizing.
Seems like without the default routing to a default org. unit and corresponding agent assignment, it is not possible to search for emails.
Regards,
Mohit