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Question 1: The read status individual to each user. It will still shown as unread.
Question 2: I'm afraid this cannot be achieved.
Hope this can be helpful. You're welcmoe:)
https://social.technet.microsoft.com/Forums/en-US/010b572c-4e9c-4300-acbf-29ceeaad75b0/outlook-2010-shared-mailbox-marked-as-readunread-issue?forum=outlook